The river and the rocks : the geologic story of Great Falls and the Potomac River Gorge / United States, Departement of the Interior, Geological Survey, National Park Service
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| MitwirkendeR: | |
|---|---|
| Place / Publishing House: | Washington, DC : Gov. Pr. Off, 1970 |
| Year of Publication: | 1970 |
| Language: | English |
| Physical Description: | V, 46 S.; zahlr. Ill., Kt. |
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