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U.S. Department of the Interior, U.S. Geological Survey, National Mapping Division, Digital Gazeteer: Users Manual, (Reston, Virginia: U.S. Geological Survey, 1994).
Least Heat Moon, William, Blue Highways: A Journey Into America, (Boston: Little Brown and Company, 1982). ISBN 0-316-35329-9
Jouris, David, All Over The Map, (Berkeley, California: Ten Speed Press, 1994.) ISBN 0-89815-649-1
Report: "Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions," Federal Information Processing Standards, FIPS 10-4. Standard was withdrawn in September 2008, See Federal Register Notice: Vol. 73, No. 170, page 51276 (September 2, 2008)
