The Online Books Page

Books by Henry Hamilton Gray:

Books in the extended shelves:

• Gray, Henry Hamilton, 1922-: Geology of the upper East Fork drainage basin, Indiana (State of Indiana, Dept. of Natural Resources, Geological Survey, 1966), also by Allan Frank Schneider (page images at HathiTrust)
• Gray, Henry Hamilton, 1922-: Lake Monroe land suitability study : a technical report on a selected portion of the Lake Monroe watershed (Indiana University, School of Public and Environmental Affairs, Center for Urban and Regional Analysis, 1975), also by Indiana University. School of Public and Environmental Affairs (page images at HathiTrust)
• Gray, Henry Hamilton, 1922-: Lithostratigraphy of the Maquoketa Group (Ordovician) in Indiana (Bloomington, Ind., 1972) (page images at HathiTrust)
• Gray, Henry Hamilton, 1922-: The Mississippian and Pennsylvanian (Carboniferous) Systems in the United States--Indiana (U.S. Govt. Print. Off., 1979), also by Indiana Geological Survey (page images at HathiTrust)

Find more by Henry Hamilton Gray at your library, or elsewhere.