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Graphic
Etc: Maps Etc: Preglacial Drainage of Western Pennsylvania, 1911 Graphic
Curated OER

Etc: Maps Etc: Preglacial Drainage of Western Pennsylvania, 1911

For Students 9th - 10th
A map from 1911 showing the probable preglacial drainage of western Pennsylvania. The limit of glaciation is shown by the broken crossed line.
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