IGC Field Trip T157: Valley and Ridge and Blue Ridge Traverse, Central Virginia.
| Autor: | Spencer, Edgar W., Bell, J. David, Kozak, Samuel J. |
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| Zdroj: | Valley & Ridge & Blue Ridge Traverse, Central Virginia; 1989, p1-63, 63p |
| Databáze: | Complementary Index |
| Externí odkaz: |
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