| This Web site contains information on activities of the National Geologic Map Database Project (NGMDB). The NGMDB is a collaborative effort primarily involving the USGS and the Association of American State Geologists. This Web site contains informal, generally time-sensitive material intended for project members, cooperators, and interested parties. |
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  (Search for maps and geologic names) |
| Publications and General Info
|| En Espaņol
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| Standards and Guidelines
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| Developing an Online Map Database
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| Information for NGMDB partners
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