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| Geological Survey (U.S.) (1403) |
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| Geological Survey (U.S.) (1403) |
| Mines and mineral resources (98) |
| Leveling (77) |
| Geology, Economic (49) |
| Coal (36) |
| Bibliography (29) |
| Geology (29) |
| Ore deposits (29) |
| Petroleum (26) |
| Water (26) |