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- United States. Bureau of Transportation Statistics27
- Stackhouse, Cecil17
- National Atlas of the United States14
- Geological Survey (U.S.)12
- Cao, Changyong10
- Earle, Carville10
- Heppen, John10
- Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology.10
- Otterstrom, Samuel10
- United States. Bureau of the Census. Geography Division6
- Gap Analysis Program (U.S.)3
- Arndt, Raymond E.2
- Bawiec, Walter J.2
- Beikman, Helen M.2
- Godt, Jonathan W.2
- King, Philip B.2
- Schruben, Paul G.2
- Alvarez, Noemi1
- Blackburn, Laura1
- Canada Centre for Mapping1