Skidmore College 16 Geological Society of America 13 Decade of North American Geology Project 6 National Geographic Society (U.S.) 6 Haworth, R. T. 4 Keen, C. E. 4 A.J. Nystrom and Company 3 Adirondack Mountain Club 3 Boccio, Deborah 3 Gilbert, Martin, 1936-2015 3 Hayes, Derek, 1947- 3 Jimapco (Firm) 3 Knowlton, Daniel C. 1876-1966 3 National Geographic Maps (Firm), 3 Oxford University Press 3 Archer, J. Clark 2 Barnes, Ian, 1946-2014, 2 Carey, A. 2 Carnes, Mark C. 1950- 2 Ehrenberg, Ralph E., 1937- 2 Eltis, David, 1940- 2 Geological Survey (U.S.) 2 George Philip & Son 2 Hazen, Charles Downer, 1868-1941 2 Illinois State Geological Survey 2 Martis, Kenneth C. 2 National Geographic Society (U.S.). Book Division 2 New York (State). Department of Environmental Conservation 2 New York (State). Forest, Fish and Game Commission 2 New York State Geological Survey 2 Richardson, David, 1946- 2 Saratoga County Chamber of Commerce 2 Shelley, Fred M., 1952- 2 Solnit, Rebecca, 2 Times Books (Firm) 2 University of California Press 2 Webster, Hutton, 1875-1955 2 Westwood, J. N. 2 Abazov, Rafis 1 Adirondack Park Agency (N.Y.) 1 Albu, Emily, 1945- 1 American Cancer Society 1 American Geographical Society of New York 1 Archer, J. Clark, 1 Arctic Institute of North America 1 Ashworth, Mike 1 Atlantov, Vladimir, 1 Bagnall, Roger S. 1 Balkwill, H. R. 1 Barlow, Philip L. 1 more ...