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United States. Army. Corps of Engineers. Pittsburgh District.
Remove constraint All Creators: United States. Army. Corps of Engineers. Pittsburgh District.
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Dams--Monongahela River (W. Va. and Pa.)--Maps.
Remove constraint Subject Topical: Dams--Monongahela River (W. Va. and Pa.)--Maps.
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Locks (Hydraulic engineering)--Allegheny River (Pa. and N.Y.)--Maps.
Remove constraint Subject Topical: Locks (Hydraulic engineering)--Allegheny River (Pa. and N.Y.)--Maps.
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