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Natural history -- Pennsylvania

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• Natural history -- Pennsylvania -- Bucks County
• Natural history -- Pennsylvania -- Delaware County
• Natural history -- Pennsylvania -- Lancaster County
• Botany -- Pennsylvania
• Geology -- Pennsylvania
• Zoology -- Pennsylvania

• Extinct Pennsylvania Animals (2 volumes; Altoona, PA: Altoona Tribune Pub. Co., 1917-1919), by Henry W. Shoemaker (page images at HathiTrust)
• Barton's Fragments of the natural history of Pennsylvania, [pt. 1] ([Printed by Taylor and Francis], 1883), by Benjamin Smith Barton, Osbert Salvin, and London Willughby Society for the Reprinting of Scarce Ornithological Works (page images at HathiTrust)
• The Wissahickon hills; (University of Pennsylvania press, 1930), by Cornelius Weygandt (page images at HathiTrust)
• Fragments of the natural history of Pennsylvania (Lond., 1883), by Benjamin Smith Barton (page images at HathiTrust)
• Reis door Noord Amerika (By J. van Schoonhoven en Comp. en G. van den Brink Janz., 1772), by Pehr Kalm (page images at HathiTrust)
• Travels into North America containing its natural history, and a circumstantial account of its plantations and agriculture in general : with the civil, ecclesiastical and commercial state of the country, the manners of the inhabitants, and several curious and important remarks on various subjects (Printed by William Eyres, 1771), by Pehr Kalm (page images at HathiTrust)
• Travels into North America containing its natural history, and a circumstantial account of its plantations and agriculture in general : with the civil, ecclesiastical and commercial state of the country, the manners of the inhabitants, and several curious and important remarks on various subjects (Printed for T. Lowndes ..., 1772), by Pehr Kalm (page images at HathiTrust)
• Fragments of the natural history of Pennsylvania. By Benjamin Smith Barton, M.D. Correspondent-member of the Society of Antiquaries of Scotland; member of the American Philosophical Society; fellow of the American Academy of Arts and Sciences of Boston; corresponding member of the Massachusetts Historical Society; member of the Physical Society of Jena; one of the foreign members of the Linnaean Society of London; and professor of materia medica, natural history and botany, in the University of Pennsylvania, ; Part first. ; [Two lines of Latin quotations] (Philadelphia: : Printed, for the author, by Way & Groff, no. 48, North Third-Street., 1799), by Benjamin Smith Barton (HTML at Evans TCP)

• History of Bucks county, Pennsylvania, from the discovery of the Delaware to the present time (The Lewis Pub. Co., 1905), by W. W. H. Davis, John W. Jordan, and Warren S. Ely (page images at HathiTrust)
• The history of Bucks County, Pennsylvania : from the discovery of the Delaware to the present time (Democrat Book and Job Office Print, 1876), by W. W. H. Davis (page images at HathiTrust)
• The plants, birds and mammals of Bucks County, Pa. (W.W H. Davis, printer, 1876), by Joseph Thomas, W. W. H. Davis, and I. S. Moyer (page images at HathiTrust)

• History of Delaware County, Pennsylvania (Philadelphia: Printed by H. B. Ashmead, 1862), by George Smith (PDF at delawarecountyhistory.com; 142 MB)
• History of Delaware County, Pennsylvania : from the discovery of the territory included within its limits to the present time, with a notice of the geology of the country, and catalogues of its minerals, plants, quadrupeds, and birds (Delaware County Institute of Science, 1976), by George Smith and Pa.) Delaware County Institute of Science (Media (page images at HathiTrust; US access only)
• History of Delaware County, Pennsylvania, from the discovery of the territory included within its limit to the present time, with a notice of the geology of the county, and catalogues of its minerals, plants, quadrupeds, and birds, written under the direction and appointment of the Delaware County Institute of Science (Printed by H.B. Ashmead, 1862), by George Smith and Pa.) Delaware County Institute of Science (Media (page images at HathiTrust)

• History of Lancaster County : to which is prefixed a brief sketch of the early history of Pennsylvania (Gilbert Hills, 1844), by I. Daniel Rupp (page images at HathiTrust)
• History of Lancaster County. (G. Hills, 1844), by Israel Daniel Rupp (page images at HathiTrust)
• An authentic history of Lancaster County : in the state of Pennsylvania (J.E. Barr & Co., 1869), by J. I. Mombert (page images at HathiTrust)

• Handbook of the Flora of Philadelphia and Vicinity (Philadelphia: Philadelphia Botanical Club, 1905), by Ida Augusta Keller and Stewardson Brown (page images at HathiTrust)
• Compendium floræ philadelphicæ : containing a description of the indigenous and naturalized plants found within a circuit of ten miles around Philadelphia (published by M. Carey, 1818), by William P. C. Barton (page images at HathiTrust)
• The grasses of Pennsylvania. (Harrisburg, 1924), by Ernest Milton Gress (page images at HathiTrust)
• The ferns and flowering plants of central Pennsylvania (State College, Pa., 1937), by James Peter Kelly (page images at HathiTrust)
• Check-list of the woody plants of a portion of the South Mountains near Mont Alto, Pennsylvania. ([n. p.], 1913), by Pennsylvania. Department of Forests and Waters and J. S. Illick (page images at HathiTrust; US access only)
• Flora of Northeastern Pennsylvania (Everhart Museum of Natural History, Science and Art, 1917), by Alfred Twining (page images at HathiTrust)
• The Flora of the upper Susquehanna and its tributaries. (W. N. Clute, 1898), by Willard Nelson Clute (page images at HathiTrust)
• Flora of Pennsylvania (Ginn & Company, 1903), by Thomas C. Porter and John Kunkel Small (page images at HathiTrust)
• Flora of the Conowingo Barrens of Southeastern Pennsylvania (The Academy], 1911), by Francis W. Pennell and Academy of Natural Sciences of Philadelphia (page images at HathiTrust)
• The Ailanthus tree in Pennsylvania (Harrisburg, Pa., 1926), by Joseph S. Illick and E. F. Brouse (page images at HathiTrust)
• Folk medicine plants used in the Pennsylvania Dutch country. (Wieand's Pennsylvania Dutch, 1961), by Paul R. Wieand (page images at HathiTrust; US access only)
• Journal of a botanical excursion in the northeastern parts of the states of Pennsylvania and New York : during the year 1807 ([The Association], 1923), by Frederick Pursh, William Martin Beauchamp, and Onondaga Historical Association (page images at HathiTrust)
• Native plants of Pennsylvania, a trail guide to Bowman's Hill State Wild Flower Preserve, Washington Crossing State Park, Bucks County, Pennsylvania. (Livingston Pub. Co., 1963), by Conservation Council of Eastern Pennsylvania. Bowman's Hill State Wildflower Preserve Committee (page images at HathiTrust; US access only)
• Journal of a botanical excursion in the northeastern parts of the states of Pennsylvania and New York during the year 1807 (s.n.], 1869), by Frederick Pursh (page images at HathiTrust)

• Report of the geological survey of Pennsylvania ... 1885-1887 (Board of commissioners for the geological survey, 1885), by Pennsylvania. State Geologist (1874-1890), Pennsylvania. Board of Commissioners for the Second Geological Survey, and Pennsylvania. Geological Survey (1874-1890) (page images at HathiTrust)
• Report of progress. (Pub. by the Board of Commissioners for the Second Geological Survey., 1874), by Geological Survey of Pennsylvania and Pennsylvania. Board of Commissioners for the Second Geological Survey (page images at HathiTrust)
• Progress report - Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey. (Pennsylvania Geological Survey, 1919), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)
• Mineral resource report M 46- 1963- (Bureau of Topographic and Geologic Survey., 1924), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)
• General geology report G 1- 1931- (Bureau of Topographic and Geologic Survey., 1931), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust; US access only)
• Well-sample record. (Bureau of Topographic and Geologic Survey., 1924), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust; US access only)
• Transactions of the Geological society of Pennsylvania. (James Kay, jun. & brother;, 1835), by Geological Society of Pennsylvania (page images at HathiTrust)
• Educational series. (Pennsylvania State Geological Survey., 1962), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust; US access only)
• Bulletin A <85ab, 157D> (Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, in the 1960s), by Geological Survey (U.S.) and Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)
• Annual report on the Geological Survey of Pennsylvania. (Harrisburg, 1836), by Geological Survey of Pennsylvania and Henry D. Rogers (page images at HathiTrust)
• Guidebook to the geology of the Pennsylvania turnpike (Dept. of Internal Affairs, Topographic and Geologic Survey, 1942), by Arthur B. Cleaves and Geo. H. Ashley (page images at HathiTrust)
• Mémoire sur la géologie de la partie sud-est de la Pennsylvanie ... (Imprimerie Six-Horemans, 1882), by Persifor Frazer (page images at HathiTrust)
• Contributions to the mineralogy of the Newark group in Pennsylvania ... (Philadelphia, 1910), by Edgar T. Wherry (page images at HathiTrust)
• The Helderberg limestone of central Pennsylvania. ([Washington, 1917), by John B. Reeside (page images at HathiTrust)
• Pennsylvania glaciation, first phase; materials for a discussion of the attenuated border of the moraine described in volume Z of the second Geological survey of Pennsylvania (Woodstock, Vt., 1917), by Edward Higginson Williams (page images at HathiTrust)
• First[-sixth] annual report on the Geological survey of Pennsylvania (Harrisburg, 1836), by Geological Survey of Pennsylvania and Henry D. Rogers (page images at HathiTrust)
• The geology of Pennsylvania; a government survey: with a general view of the geology of the United States, essays on coal-formation and its fossils, and a description of the coalfields of North America and Great Britain (W. Blackwood and sons;, 1858), by Geological Survey of Pennsylvania (page images at HathiTrust)
• Historical sketch of geological explorations in Pennsylvania and other states (Pub. by the Board of commissioners for the Second geological survey, 1876), by J. P. Lesley (page images at HathiTrust)
• Report on the New Red of Bucks and Montgomery counties ([Harrisburg], 1895), by Benjamin Smith Lyman (page images at HathiTrust)
• The geology of the Pittsburgh coal region. ([New York, 1886), by J. P. Lesley (page images at HathiTrust)
• The geomorphology of the Wyoming-Lackawanna region (The Wertley press], 1936), by Harry Augustus Itter (page images at HathiTrust; US access only)
• Catalogue of the Geological museum. (Pub. by the Board of commissioners for the Second geological survey, 1878), by Charles Edward Hall (page images at HathiTrust)
• Geologic map of southwestern Pennsylvania ... (W. S. Ray, state printer, 1914), by Pennsylvania. Topographic and Geological Survey Commission (page images at HathiTrust)
• Second geological Survey of Pennsylvania: 1874. (Pub. by the Board of commissioners for the Second geological survey, 1876), by Persifor Frazer, Pennsylvania. Board of Commissioners for the Second Geological Survey, and Geological Survey of Pennsylvania (page images at HathiTrust)
• Second Geological Survey of Pennsylvania. 1875 (Pub. by the Board of commissions for the Second geological survey, 1877), by Persifor Frazer, Pennsylvania. Board of Commissioners for the Second Geological Survey, and Geological Survey of Pennsylvania (page images at HathiTrust)
• Report of progress in the Juniata district on the fossil iron ore beds of middle Pennsylvania (Pub. by the Board of commissioners for the Second geological survey, 1878), by John H. Dewees, Henry Martyn Chance, Richard H. Sanders, Franklin Platt, and Charles A. Ashburner (page images at HathiTrust)
• Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata with descriptions. Of the Clinton fossil ore mines, Marcellus carbonate iron ore mines, Oriskany glass sand mines, and Lewistown limestone quarries ... (Pub. by the Board of commissioners for the Second geological survey, 1891), by Edward Vincent D'Invilliers (page images at HathiTrust)
• The geology of Pike and Monroe counties. (Pub. by the Board of commissioners for the Second geological survey, 1882), by I. C. White and Henry Martyn Chance (page images at HathiTrust)
• The geology of the Susquehanna River regíon in the six counties of Wyoming, Lackwanna, Luzerne, Columbia, Montour, and Northumberland. (Pub. by the Board of commissioners for the Second geological survey, 1883), by I. C. White (page images at HathiTrust)
• Report of progress in the Clearfield and Jefferson district of the bituminous coal-fields of western Pennsylvania. (Pub. by the Board of commissioners for the Second geological survey, 1875), by Franklin Platt (page images at HathiTrust)
• Report of progress in the Fayette & Westmoreland district of the bituminous coal-fields of western Pennsylvania (Pub. by the Board of commissioners for the Second geological survey, 1877), by John J. Stevenson (page images at HathiTrust)
• Report of progress in the Beaver river district of the bituminous coal-fields of western Pennsylvania (Pub. by the Board of commissioners for the Second geological survey, 1878), by I. C. White and Andrew S. McCreath (page images at HathiTrust)
• The geology of McKean County, and its connection with that of Cameron, Elk and Forest. (Pub. by the Board of commissioners for the Second geological survey, 1880), by Charles A. Ashburner (page images at HathiTrust)
• The township geology of Elk and Forest counties (Pub. by the Board of commissioners for the Second geological survey, 1885), by Charles A. Ashburner and Arthur Whitcomb Sheafer (page images at HathiTrust)
• Misc[ellaneous] papers (Dept. of internal affairs, Bureau of topographic and geologic survey, 1920), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)
• Report (The Board, 1874), by Pennsylvania. Board of Commissioners for the Second Geological Survey (page images at HathiTrust)
• A summary description of the geology of Pennsylvania (Geological survey of Pennsylvania, 1892), by J. P. Lesley and Geological Survey of Pennsylvania. Board of Commissioners (page images at HathiTrust)
• Electrical properties and attenuation distance of upper Pennsylvanian coal measure rock from southwestern Pennsylvania (U.S. Dept. of the Interior, Bureau of Mines, 1984), by David P. Lindroth, Andrew L. Dehler, and Carl F. Wingquist (page images at HathiTrust)
• A study of the igneous rocks at York Haven and Stony Brook, Pa. and their accompanying formations ... (Avil printing company, 1898), by Frederick Ehrenfeld (page images at HathiTrust)
• Report of progress. (Board of Commissioners for the Second Geological Survey., 1874), by Geological Survey of Pennsylvania and Pennsylvania. Board of Commissioners for the Second Geological Survey (page images at HathiTrust)
• Bulletin A. Atlas (Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey., 1929), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust; US access only)
• Stratigraphy of the bitmuninous coal field of Pennsylvania, Ohio and West Virginia (Govt. Print. Off., 1891), by I. C. White (page images at HathiTrust)
• Bulletin IC no. 60-<62> 65, 67 (Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1951), by Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust; US access only)
• The township geology of Elk and Forest counties and of Cameron County : related especially to the geology of the coal measures of the Carboniferous Age (Pub. by the Board of Commissioners for the Second Geological Survey, 1885), by Charles A. Ashburner and A. W. Sheafer (page images at HathiTrust)
• Geologic interpretation of aeromagnetic maps of Southeastern Pennsylvania (Pennsylvania Bureau of Topographic and Geologic Survey, 1974), by Pennsylvania. Bureau of Topographic and Geologic Survey and Arthur A. Socolow (page images at HathiTrust; US access only)
• Some structural features of the northern anthracite coal basin, Pennsylvania (United States Government Printing Office :, 1940), by Nelson Horatio Darton (page images at HathiTrust; US access only)
• Geological report of progress in the laboratory of the Survey at Harrisburg (Pub. by the Board of Commissioners for the Second Geological Survey, 1875) (page images at HathiTrust; US access only)
• The Martinsburg formation (Middle and Upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey (U.S. Govt. Print. Off., 1967), by Avery Ala Drake (page images at HathiTrust; US access only)
• Report of progress in the district of York and Adams counties : illustrated by maps and cross-sections, showing the iron ore belts and individual mines; with descriptions of the same, notes on a transit line to establish altitudes, and a catalogue of specimens collected and placed in the museum at Harrisburg (published by the Board of Commissioners for the Second Geological Survey, 1876), by Persifor Frazer (page images at HathiTrust)
• Report of progress in Bradford and Tioga counties. (Board of Commissioners for the Second Geological Survey, 1878), by Andrew Sherwood and J. P. Lesley (page images at HathiTrust)
• A special survey made in 1875 along the Beaver and Shenango rivers in Butler, Lawrence and Mercer counties. Part second (Board of Commissioners for the Second Geological Survey, 1879), by H. M. Chance (page images at HathiTrust)
• Special report on the trap dykes and Azoic rocks of southeastern Pennsylvania (Pub. by the Board of commissioners for the Second geological survey, 1878), by Thomas Sterry Hunt (page images at HathiTrust)
• Pennsylvania geology summarized (Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey, 1960), by Bradford Willard (page images at HathiTrust; US access only)
• Subsurface Cambro-Ordovician stratigraphy of northwestern Pennsylvania and bordering states. (Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geological Survey, 1961), by Warren Richard Wagner (page images at HathiTrust; US access only)
• Albert no. 1 well, Adams Township, Snyder County (Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey, 1958), by Walter Richard Wagner and Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust; US access only)
• Recent geological history of the Delaware valley below the water gap (Department of Internal Affairs, Topographic and Geologic Survey, 1938), by Freeman Ward (page images at HathiTrust; US access only)
• ... Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania, in three volumes, with a new geological map of the state, a map and list of bituminous mines ... (Pub. by the Board of commissioners for the Geological survey, 1892), by Pennsylvania. Geological survey 1874-1890) and William Armstrong Ingham (page images at HathiTrust)
• The Helderberg limestone of central Pennsylvania ... ([Washington, 1915), by John B. Reeside (page images at HathiTrust)
• The geology of Pennsylvania : a government survey (J.B. Lippincott, 1858), by Henry D. Rogers and Geological Survey of Pennsylvania (page images at HathiTrust)
• Report of progress 1874-1889, A-Z. (Board of Commissioners for the Second Geological Survey, 1875), by Geological Survey of Pennsylvania and Pennsylvania. Board of Commissioners for the Second Geological Survey (page images at HathiTrust)
• Stratigraphy of the bituminous coal field of Pennsylvania, Ohio and West Virginia (Govt. print. off., 1891), by I. C. White (page images at HathiTrust)
• Transactions of the Geological Society of Pennsylvania. (J. Kay, 1834), by Philadelphia Geological Society of Pennsylvania (page images at HathiTrust)
• Geological Survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania. (Board of Commissioners for the Geological Survey, 1892), by Geological Survey of Pennsylvania and William A. Ingham (page images at HathiTrust)
• Report of the Board of Commissioners ... ([Harrisburg], in the 19th century), by Geological Survey of Pennsylvania 1874-1890) (page images at HathiTrust)
• Report ... (C.E. Aughinbaugh, printer to the state of Pennsylvania, 1910), by Pennsylvania. Topographic and Geological Survey Commission (page images at HathiTrust)
• Annual report on the geological survey of Pennsylvania ... (Harrisburg, 1836), by Pennsylvania. State Geologist (1836-1841) (page images at HathiTrust)
• The geology of Pennsylvania : a government survey (W. Blackwood and sons ;, 1858), by Geological Survey of Pennsylvania and Henry D. Rogers (page images at HathiTrust)
• The geology of Pennsylvania : a government survey ; with a general view of the geology of the United States, essays on the coal-formation and its fossils, and a description of the coal-fields of North America and Great Britain (Van Nostrand, 1868), by Geological Survey of Pennsylvania and Henry D. Rogers (page images at HathiTrust)
• Annual report of the Geological Survey of Pennsylvania for ... (Board of Commissioners for the Geological Survey, 1886), by Geological Survey of Pennsylvania, J. P. Lesley, and Pennsylvania. Board of Commissioners for the Second Geological Survey (page images at HathiTrust)
• Catalogue of the geological museum (Board of commissioners for the Second geological survey, 1878), by Charles Edward Hall, Charles Emerson Beecher, John F. Carll, John F. Carll, Edward Waller 1835-1901 Claypole, I. C. White, I. C. White, Leo Lesquereux, F. A. Genth, Henry Carvill Lewis, and E. V. D'Invilliers (page images at HathiTrust)
• A general index of the Final summary report of the geology of Pennsylvania (Board of commissioners for the second geological survey, 1895), by Pennsylvania. State Geologist (1874-1890), William Armstrong Ingham, and Pennsylvania. State Geologist (1874-1890 (page images at HathiTrust)
• The geology of Pennsylvania : a government survey (J. B. Lippincott & co., 1858), by Pennsylvania. Geological survey and Henry D. Rogers (page images at HathiTrust)
• Economic geology of the Kittanning and Rural valley quadrangles, Pennsylvania (Govt. Print. Off., 1906), by Charles Butts and Geological Survey (U.S.) (page images at HathiTrust)
• The geological position of the Catskill group (s.n., 1891), by Charles S. Prosser (page images at HathiTrust)
• The geology of Pennsylvania; a government survey (J. B. Lippincott, 1858), by Pennsylvania. State Geologist (1836-1841) and Henry D. Rogers (page images at HathiTrust)
• Special report on the trap dykes and azoic rocks of southeastern Pennsylvania (Board of Commissioners for the Second Geological Survey, 1878), by Thomas Sterry Hunt (page images at HathiTrust)
• Annual report of the Geological Survey of Pennsylvania for 1885-1887 (Published by the Board of Commissioners for the Geological Survey, 1886), by Geological Survey of Pennsylvania (page images at HathiTrust)
• Topographic and Geologic Survey of Pennsylvania : Clay and clay products 1911 (Telegraph Print. Co., 1911), by Pennsylvania. Bureau of Topographic and Geologic Survey (1911) and Richard Robert Hice (page images at HathiTrust)
• Final report ordered by Legislature, 1891. A general index of the Final summary report of the geology of Pennsylvania, J. P. Lesley, state geologist. With an appendix containing a list of and brief guide to the publications of the Survey. (Pub. by the Board of Commissioners for the Second Geological Survey, 1895), by 2nd Pennsylvania. Geological Survey and William Armstrong Ingham (page images at HathiTrust)
• Geology of the Beaver River valley between Beaver Falls and Wampum, Pennsylvania. (1916), by LeRoy Thompson Patton (page images at HathiTrust; US access only)
• Pennsylvania Interstate 80 geologic guide (Dept. of Education, 1975), by William H. Bolles, Alan R. Geyer, Pennsylvania. Bureau of Topographic and Geologic Survey, and Pennsylvania. Bureau of Curriculum Services. Division of Science and Technology (page images at HathiTrust; US access only)
• Southern Pennsylvania and Maryland (U.S. Govt. Print. Off., 1932), by George Willis Stose, Eleanora Frances Bliss Knopf, Geo. H. Ashley, Anna I. Jonas, Geological Survey (U.S.), and D.C.) International Geological Congress (16th : 1933 : Washington (page images at HathiTrust)
• One hundred years : centennial celebration of the first Pennsylvania Geological Survey (Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Typographic and Geologic Survey, 1936), by Geological Survey of Pennsylvania (page images at HathiTrust; US access only)
• Drainage basins, channels, and flow characteristics of selected streams in central Pennsylvania (U.S. Govt. Print. Off., 1961), by Lucien M. Brush (page images at HathiTrust; US access only)
• Blue book of the geological field excursion from New York to Gettysburg. (Columbia university press, 1926), by Douglas Wilson Johnson (page images at HathiTrust)
• Radioactive trace elements in upper Devonian clastic rocks, north central Pennsylvania ([Troy, New York] : Rensselaer Polytechnic Institute, Department of Geology, [1971}, 1971), by Matthew Humphreys, Gerald M. Friedman, Rensselaer Polytechnic Institute, and U.S. Atomic Energy Commission (page images at HathiTrust)
• Second Geological Survey of Pennsylvania: 1875. (Pub. by the Board of Commissioners for the Second Geological Survey, 1876), by John J. Stevenson and Geological Survey of Pennsylvania (page images at HathiTrust)
• Second Geological Survey of Pennsylvania : report of progress V (Pub. by the Board of Commissioners for the Second Geological Survey, 1879), by H. M. Chance, Pennsylvania. Board of Commissioners for the Second Geological Survey, and Geological Survey of Pennsylvania (page images at HathiTrust)
• Geology. (New York), by Archibald Geikie (page images at HathiTrust; US access only)
• Pennsylvania Survey (Pennsylvania. Bureau of Topographic and Geologic Survey, 1922), by Geo. H. Ashley and Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)
• The geology of New York and northern Pennsylvania (Issued by the American petroleum institute, Division of production, 1932), by Paul Dwight Torrey, Paul M. Phillippi, Charles Brewer, Wilbur H. Young, Charles E. Fralich, and American Petroleum Institute. Division of Production (page images at HathiTrust; US access only)
• Pennsylvania Geological Survey, fourth series (Pennsylvania Bureau of Topographic and Geologic Survey, 1926), by Geo. H. Ashley and Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)
• Geologic structure of the Greensburg quadrangle, Penna. (Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey ;, 1922), by Meredith E. Johnson and Pennsylvania. Bureau of Topographic and Geologic Survey (page images at HathiTrust)

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