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Page is maintained by David Barthelmy. Typically, the guidebook contains descriptions of the geological features along an itinerary, and is thus a resource for local geology. The database includes both a geographic index and a stratigraphic index by which a user can zero in on a particular locality. Since most field trip guidebooks are not available through bookstores and not widely distributed, the database names at least one library which has each guidebook. The database also includes an up to date directory of the libraries that have been listed as guidebook sources, for use in requesting a copy or interlibrary loan of a guidebook.