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Online Reference Sources

A guide to the variety of electronic reference resources available to the ESU community.

Earth Sciences

National Geologic Map Database
The National Geologic Map Database (NGMDB) is a Congressionally mandated national archive of geoscience maps, reports, and stratigraphic information. The database contains information on more than 90,000 maps and related geoscience reports published from the early 1800s to the present day, by more than 630 agencies, universities, associations, and private companies.