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You searched for: Medium glass plate negative Remove constraint Medium: glass plate negative Topical Subjects Rivers--Monongahela. Remove constraint Topical Subjects: Rivers--Monongahela. Topical Subjects Locks (Hydraulic engineering)--Monongahela River (W. Va. and Pa.)--Design and construction. Remove constraint Topical Subjects: Locks (Hydraulic engineering)--Monongahela River (W. Va. and Pa.)--Design and construction.
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View of construction of lock and dam along Monongahela River.