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  • #1 Federal

    USGS National Geologic Map Database Collection

    The National Geologic Map Database (NGMDB) is a Congressionally mandated national archive of geoscience maps, reports, and stratigraphic information. The Geologic Mapping Act of 1992 and its...

    Search relevance: 1.00 | Views last month: 43 | Catalog Last Checked: August 01, 2026 at 05:53 AM

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