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You searched for: Creator Corporate Names United States. Army. Corps of Engineers. Pittsburgh District. Remove constraint Creator Corporate Names: United States. Army. Corps of Engineers. Pittsburgh District. All Subjects Dams--Monongahela River (W. Va. and Pa.)--Maps. Remove constraint All Subjects: Dams--Monongahela River (W. Va. and Pa.)--Maps. All Subjects Dams--Pennsylvania--Pittsburgh Region--Maps. Remove constraint All Subjects: Dams--Pennsylvania--Pittsburgh Region--Maps. All Subjects Locks (Hydraulic engineering)--Monongahela River (W. Va. and Pa.)--Maps. Remove constraint All Subjects: Locks (Hydraulic engineering)--Monongahela River (W. Va. and Pa.)--Maps. All Subjects Locks (Hydraulic engineering)--Pennsylvania--Pittsburgh Region--Pictorial works. Remove constraint All Subjects: Locks (Hydraulic engineering)--Pennsylvania--Pittsburgh Region--Pictorial works.

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