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You searched for: All Creators Harrison, David C. Remove constraint All Creators: Harrison, David C. Subject Geographic Monongahela River (W. Va. and Pa.)--Environmental aspects. Remove constraint Subject Geographic: Monongahela River (W. Va. and Pa.)--Environmental aspects. All Subjects Monongahela River Valley (W. Va. and Pa.)--Economic conditions. Remove constraint All Subjects: Monongahela River Valley (W. Va. and Pa.)--Economic conditions.

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