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| Virginia -- Rockbridge County (2) |
| Washington and Lee University -- Honors in Geology (2) |
| Facies (Geology) -- Analysis (1) |
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| Soils -- Carbon content -- Analysis (1) |
| Virginia -- Rockbridge County (2) |
| Washington and Lee University -- Honors in Geology (2) |
| Facies (Geology) -- Analysis (1) |
| Geology, Stratigraphic (1) |
| Soils -- Carbon content -- Analysis (1) |