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Creator Corporate Names
United States. Army. Corps of Engineers. Pittsburgh District.
Remove constraint Creator Corporate Names: United States. Army. Corps of Engineers. Pittsburgh District.
Subject Topical
Locks (Hydraulic engineering)--Allegheny River (Pa. and N.Y.)--Maps.
Remove constraint Subject Topical: Locks (Hydraulic engineering)--Allegheny River (Pa. and N.Y.)--Maps.
Subject Topical
Locks (Hydraulic engineering)--Pennsylvania--Pittsburgh Region--Pictorial works.
Remove constraint Subject Topical: Locks (Hydraulic engineering)--Pennsylvania--Pittsburgh Region--Pictorial works.
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