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"Aggregate accessibility to population at the county level: U.S. 1940-2000."
Morton E. O'Kelly, Mark W. Horner (2003)
- Morton E. O'Kelly, Mark W. Horner:
Aggregate accessibility to population at the county level: U.S. 1940-2000. J. Geogr. Syst. 5(1): 5-23 (2003)
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