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United States. Army. Corps of Engineers. Pittsburgh District.
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Dams--Ohio River--Maps.
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Dams--Pennsylvania--Pittsburgh Region--Maps.
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Locks (Hydraulic engineering)--Monongahela River (W. Va. and Pa.)--Maps.
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Locks (Hydraulic engineering)--Pennsylvania--Pittsburgh Region--Maps.
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Locks (Hydraulic engineering)--Pennsylvania--Pittsburgh Region--Pictorial works.
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