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You searched for: Creator Personal Names Harrison, David C. Remove constraint Creator Personal Names: Harrison, David C. Subject Geographic Monongahela River Valley (W. Va. and Pa.)--Economic conditions. Remove constraint Subject Geographic: Monongahela River Valley (W. Va. and Pa.)--Economic conditions. All Subjects Water quality--Monongahela River Valley (W. Va.). Remove constraint All Subjects: Water quality--Monongahela River Valley (W. Va.).

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