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Institution
Format
Subject
6
Landslides
4
Allegheny County (Pa.)
4
Subsidences (Earth movements)
2
Coal mines and mining
2
Geology
1
Allegheny County (Pa.) Climate
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1
Floods
1
Groundwater
1
Land use
1
Land use Environmental aspects
1
Mine subsidences
1
Pittsburgh Region (Pa.)
1
Rain and rainfall
1
Slopes (Physical geography)
1
Soil erosion
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Author
Appalachian Regional Commission
7
Geological Survey (U.S.)
5
Pomeroy, John S., 1929-
4
Briggs, Reginald P., 1929-2009
4
Davies, William E. 1917-
3
Kohl, William R.
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2
Briggs, Reginald P., 1929-2009,
2
Geological Survey (U.S.),
2
Subitzky, Seymour, 1923-
1
Bushnell, Kent O.
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