Index to maps in books and periodicals (American Geographical Society of New York Map Dept.)
GA 192 A72 1968. Folio v. 1-10 and supplements
Index to maps of the American Revolution in books and periodicals: illustrating the Revolutionary War and other events of the period 1763-1789. Z1238 .C55 Ref.
USGS map catalogs and indexes (available in most libraries that have USGS maps):
Geological map index of various states
Index to topographic and other map coverage
Index to intermediate scale mapping
Index to orthophoto quad mapping
Index to USGS/DMA 1:50,000 scale mapping
Index to land cover maps and digital data
Index to national aerial photography
Index to digital line graphs
U.S. Gazetteer: The U.S. Gazetteer Files provide a listing of all geographic areas for selected geographic area types. The files include geographic identifier codes, names, area measurements, and representative latitude and longitude coordinates.