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1
The Pennsylvania scenic rivers inventory /
Published 1975
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2
Rivers in the city.
by Mann, Roy.
Published 1973
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3
The range of choice in water management ; a study of dissolved oxygen in the Potomac estuary /
by Davis, Robert K.
Published 1968
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4
Flow east ; a look at our North Atlantic rivers /
by Kauffmann, John M.
Published 1973
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5
Environmental effects of complex river development /
Published 1977
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