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Least Heat Moon, William, Blue Highways: A Journey Into America, (Boston: Little Brown and Company, 1982). ISBN 0-316-35329-9
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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 Standard was withdrawn in September 2008, See Federal Register Notice: Vol. 73, No. 170, page 51276 (September 2, 2008)