The River and the rocks : the geologic story of Great Falls and the Potomac River Gorge

[published by] U.S. Geological Survey, National Park Service
Bok Engelsk 1970


Utgitt	Washington : Department og Interior , 1970
Omfang	V, 46 s. : ill., kart
Emner	Geology - Great Falls, Potomac River Great Falls, Potomac River - Guidebooks Natural history - Guidebooks - Great Falls, Potomac River

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