1 Finding Aid.
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Canals in subject [X]
Steamboats in subject [X]
Railroads - Pittsburgh and Connellsville Railroad. in subject [X]
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Canals[X]
Dams (1)
Ohio Valley - rivers. (1)
Railroads - Pittsburgh and Connellsville Railroad.[X]
Rivers and river valleys. (1)
Steamboats[X]
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