Oskar Augustus Johannsen (14 May 1870, Davenport, Iowa – 7 November 1961, Ithaca, New York), was an (From Wikipedia)
More about O. A. Johannsen: Associated authors:Books by O. A. Johannsen:
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Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic Insects in New York State (New York State Museum bulletin #68 (Entomology 18); Albany, NY: University of the State of New York, 1903), also by James G. Needham, Alex. D. MacGillivray, and Kary Cadmus Davis
Additional books by O. A. Johannsen in the extended shelves:
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Johannsen, O. A. (Oskar Augustus), 1870-1961: Apple tree insects of Maine. ([Orono, 1910), also by Edith M. Patch and Maine Agricultural Experiment Station (page images at HathiTrust)- Johannsen, O. A. (Oskar Augustus), 1870-1961: Apple tree insects of Maine. ([Orono, 1910), also by Edith M. Patch and Maine Agricultural Experiment Station (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Apple tree insects of Maine (Maine Agricultural Experiment Station, 1916), also by Edith M. Patch and Maine Agricultural Experiment Station (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic Diptera. (Ithaca, N.Y., 1933), also by Cornell University. Agricultural Experiment Station (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic Diptera ... (The University, 1934) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic diptera. Part I, Nemocera, exclusive of Chironomidae and Ceratopogonidae (Cornell University, 1934) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic diptera. Part II, Orthorrhapha-brachycera and Cyclorrhapha (Cornell University, 1935) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic diptera. Part III, Chironomidae, subfamilies Tanypodinae, Diamesinae, and Orthocladiinae (Cornell University, 1937) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic diptera : parts IV and V. (Cornell University, 1937), also by Lillian C. Thomsen (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic insects in New York state ; a study conducted at the entomologic field station, Ithaca, N. Y. under the direction of Ephraim Porter Felt. (University of the state of New York, 1903), also by James G. Needham, Kary Cadmus Davis, and Alexander Dyer MacGillivray (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic nematocerous diptera. (University of the State of New York, 1903) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic nematocerous Diptera. [1], 2. (1903) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Aquatic nematocerous Diptera, II. Chironomidae ... (Ithaca, N.Y., 1905) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Dame bug and her babies (Pine Cone Publishing Company, 1913), also by Edith M. Patch (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Diptera, fam. Mycetophilidae ... (M. P. Wytsman, 1909) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Embryology of insects and myriapods : the developmental history of insects, centipedes, and millepedes from egg desposition []] to hatching (McGraw-Hill book company, inc., 1941), also by Ferdinand Hinckley Butt (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Four insect pests. ([Orono, Me., 1911), also by Maine Agricultural Experiment Station and Edith M. Patch (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: The fungus gnats of North America ([University of Maine], 1909) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: The fungus gnats of North America, part IV (Maine Agricultural Experiment Station, 1912) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Genera of plancton organisms of the Cayuga Lake basin (Cornell univ. Dept. of entomology. Limnological lab, 1915) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Handbook of medical entomology (The Comstock Publishing Company, 1915), also by William A. Riley (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Handbook of Medical Entomology, also by William A. Riley (Gutenberg ebook)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Insect notes for 1909 (Maine Agricultural Experiment Station, 1910) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Insect notes for 1910 (Maine Agricultural Experiment Station, 1911), also by Maine Agricultural Experiment Station (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Insect notes for 1911 (Maine Agricultural Experiment Station, 1911), also by Edith M. Patch and Maine Agricultural Experiment Station (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Insect notes for 1912 (Maine Agricultural Experiment Station, 1912), also by Maine Agricultural Experiment Station (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Keys to the genera and species of the heteroptera of the North eastern states (exclusive of Capsidae). (n. p., 1917), also by J. Chester Bradley (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: May flies and midges of New York. Third report on aquatic insects. A study conducted at the Entomologic Field Station, Ithaca, N.Y. (New York state education department, 1905), also by James G. Needham, Ephraim Porter Felt, and Kenneth J. Morton (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Medical entomology; a survey of insects and allied forms which affect the health of man and animals (McGraw-Hill, 1932), also by William A. Riley (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Mycetophilidae of North America (Maine Agricultural Experiment Station, 1910) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: New North American Chironomidae. (1908) (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Potato flea-beetle (Epitrix cucumeris) (Maine Agricultural Experiment Station, 1913), also by Edith M. Patch (page images at HathiTrust)
- Johannsen, O. A. (Oskar Augustus), 1870-1961: Spruce bud worm and spruce leaf miners (Maine Agricultural Experiment Station, 1913), also by Maine Agricultural Experiment Station (page images at HathiTrust)
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