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

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書誌事項

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

[by] U.S. Geological Survey [and] National Park Service

[For sale by the Supt. of Docs., U.S. Govt. Print. Off.], [1970]

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注記

Bibliography: p. 46

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