Author
Geological Survey (U.S.)
34
Pennsylvania Bureau of Topographic and Geologic Survey
11
Geological Survey of Ohio
8
West Virginia Geological and Economic Survey
8
Beatty, Charles, 1715?-1772
7
Ohio and Pennsylvania Rail-Road Company
7
Harris, Thaddeus Mason, 1768-1842
6
University of the State of New York
6
Evangelical Lutheran Synod of Ohio and Adjacent States Eastern District
5
New York State Geological Survey
5
Pennsylvania
5
Rickard, Lawrence V
5
Roberts, Solomon W (Solomon White), 1811-1882
5
Robinson, John Bell
5
Six Nations
5
Taylor, John, 1754-1838
5
Bates, Robert Glenn, 1923-
4
De Witt, Wallace, Jr., 1920-2012
4
Dwight, Margaret Van Horn, 1790-1834
4
Eaton, S. J. M (Samuel John Mills), 1820-1889
4
Farrand, Max, 1869-1945
4
Hanna, Charles A (Charles Augustus), 1863-1950
4
Pepper, James F
4
Rand McNally and Company
4
South Central Pennsylvania Genealogical Society
4
U.S. Atomic Energy Commission Division of Biology and Medicine
4
Unitarian Universalist Association Ohio-Meadville District
4
Amalgamated Clothing Workers of America
3
Aughenbaugh, Gloria L
3
Costello, M. A
3
Cuming, Fortescue, 1762-1828
3
Franklin, Benjamin, 1706-1790
3
Hark, J. Max (Joseph Maximillian), 1849-1930
3
Klett, Guy S (Guy Soulliard), 1897-1990
3
Klett, Guy Soulliard
3
Loskiel, George Henry, 1740-1814
3
Ohio Division of Geological Survey
3
Scriba, Victor
3
Springirth, Kenneth C
3
United States Army. Corps of Engineers
3
United States Congress. House. Committee on the Judiciary
3
University of North Carolina (1793-1962)
3
American Culture Class Collection (University of Pennsylvania)
2
Anderson, Donald H
2
Anderson, Leo R
2
Bailey, Lester P
2
Barlow, James A
2
Bartley, Edward J
2
Benton, William, 1900-1973
2
Brown, John C., Rev
2
more ...