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glass plate negative
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Topical Subjects
Rivers--Monongahela.
Remove constraint Topical Subjects: Rivers--Monongahela.
Topical Subjects
Dams--Monongahela River (W. Va. and Pa.)--Design and construction.
Remove constraint Topical Subjects: Dams--Monongahela River (W. Va. and Pa.)--Design and construction.
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