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Past and Present Courses of Monongahela and Youghiogheny Rivers,

Title: Past and Present Courses of Monongahela and Youghiogheny Rivers
Projection: Unknown,
Source Bounding Coordinates:
W: E: N: S:

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Description: A map showing the present and pre-Pleistocene courses of Monongahela (left) and Youghiogheny rivers.
Source: Isaiah Bowman, Ph. D, Forest Physiography (New York, NY: John Wiley and Sons, 1911) 690
Map Credit: The Private Collection of Roy Winkelman

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