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Institution
Collection
Format
Subject
Author
Zandle, Gerald L.
53
Geological Survey (U.S.)
44
Bromery, Randolph W. 1926-2013
7
Boynton, G. R. 1935-
5
Henderson, John R.
5
Pittillo, D. R.
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3
Popenoe, Peter
2
Anderson, Lennart A., 1926-
1
Boynton, G. R.
1
Massachusetts. Department of Public Works
1
Mitchell, C. M.
1
Pennsylvania. Department of Internal Affairs
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Language
Genre
Region
48
Pennsylvania
11
Lancaster County
10
Berks County
10
York County
7
Montgomery County
6
Adams County
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6
Lebanon County
5
Cumberland County
5
New Jersey
4
Bucks County
3
Berkshire County
3
Dauphin County
3
Lehigh County
3
Massachusetts
3
Northampton County
2
Chester County
2
Delaware County
2
Minnesota
2
United States
2
Warren County
1
Arizona
1
Becker County
1
Clay County
1
Columbia County
1
Elverson
1
Mahnomen County
1
Maricopa County
1
Media
1
Morgantown
1
New Hampshire
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Year of Publication