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Institution
Collection
Format
Subject
8
Geology
7
Delaware Water Gap National Recreation Area (N.J. and Pa.)
6
National parks and reserves
4
Geology, Stratigraphic
4
Middle Delaware National Scenic and Recreational River (N.J. and Pa.)
3
New Jersey
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2
Mines and mineral resources
2
Pennsylvania
1
Carbonates
1
Connecticut
1
Delaware Water Gap (N.J. and Pa.)
1
Geology Research
1
Groundwater flow
1
Historic farms
1
Hydrology Research
1
Labor supply
1
Nappes (Geology)
1
Paleontology
1
Recreation areas Planning
1
Triangulation
1
Wages
1
Wages Metal-working machinery industry
1
Wages Metal-working machinery industry Employees
1
Water Iron content
1
Water resources development
1
Water-supply
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Author
5
United States. National Park Service
4
Geological Survey (U.S.)
3
Drake, Avery Ala, 1927-
2
Epstein, Jack Burton, 1935-
2
United States. Bureau of Labor Statistics
1
Bascom, F. 1862-1945
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1
Bayley, William Shirley, 1861-1943
1
Bennett, Kenneth W. (Writer on historic sites)
1
Brown, Sharon A.
1
Eldridge, George Homans, 1854-1905
1
Epstein, Anita G., 1937-
1
Gannett, Henry, 1846-1914
1
Harpers Ferry Center (U.S.)
1
Jennings, D. S. 1885-
1
Jonas, Anna I. 1881-1974
1
Keyes, Charles Rollin, 1864-1942
1
Lyttle, Peter T.
1
Prosser, Charles S. 1860-1916
1
Sloto, Ronald A.
1
Spink, Walter J.
1
Stose, George Willis, 1869-1960
1
United States. Department of the Interior
1
United States. Environmental Protection Agency
1
United States. National Park Service. Denver Service Center
1
Wherry, Edgar T. 1885-1982
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Language
Genre
Literary Form
Region
New Jersey
Pennsylvania
7
Delaware Water Gap National Recreation Area (N.J. and Pa.)
4
Middle Delaware National Scenic and Recreational River (N.J. and Pa.)
3
New York (State)
2
Philadelphia Metropolitan Area
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1
Camden County
1
Connecticut
1
Delaware Water Gap (N.J. and Pa.)
1
Gloucester County
1
North America
1
Philadelphia
1
Wyoming
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Call Number
Year of Publication