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Institution
Collection
Format
Subject
Author
50
Geological Survey (U.S.)
49
Bromery, Randolph W. 1926-2013
43
Zandle, Gerald L.
8
Henderson, John R.
4
Bennett, Bruce L. 1917-2003
2
Petty, A. J.
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1
Andreasen, Gordon E., 1924-
1
Gilbert, Francis P.
1
Griscom, Andrew
1
Johnson, Robert W., Jr., 1924-
1
Natoff, Nora C.
1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
Pennsylvania. Department of Internal Affairs
1
Popenoe, Peter
1
Tyson, Natalie S.
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Language
Genre
Region
Pennsylvania
12
Lancaster County
11
York County
10
Berks County
7
Lebanon County
7
Montgomery County
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6
Adams County
6
Bucks County
5
Cumberland County
4
Dauphin County
4
Lehigh County
2
Chester County
2
Delaware County
2
New Jersey
2
Northampton County
1
Delaware
1
Elverson
1
Hunterdon County
1
Malvern
1
Maryland
1
Media
1
Mercer County
1
Morgantown
1
New York (State)
1
Norristown
1
Parkesburg
1
Phoenixville
1
Pittsburgh Region
1
United States
1
Valley Forge
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Year of Publication