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1
Allegheny Portage Railroad National Historic Site (Pa.)
1
Coal mines and mining History
1
Historic sites
1
Locomotives History
1
Mines and mineral resources History
1
Railroad tunnels History
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1
Railroads History
1
Streamflow History
1
Tunnels Design and construction History
1
Water quality History
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Author
2
United States. National Park Service
1
Chappell, Gordon S.
1
Geological Survey (U.S.)
1
Hoffman, John N.
1
Koerkle, Edward H.
1
Nature Conservancy (U.S.)
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1
Pennsylvania. Department of Environmental Protection
1
Sellards & Grigg, Inc
1
Smithsonian Institution
1
Stuckey, Marla H.
1
Susquehanna River Basin Commission
1
Ulrich, James
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