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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.) Remove constraint Topical Subjects: Locks (Hydraulic engineering)--Monongahela River (W. Va. and Pa.)
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View of construction site of a lock and dam with crew members along Monongahela River.