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Author
- Cao, Changyong21
- Earle, Carville21
- Heppen, John21
- Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology.21
- Otterstrom, Samuel21
- National Atlas of the United States8
- Geological Survey (U.S.)5
- Hijmans, Robert J.3
- University of California, Berkeley. Museum of Vertebrate Zoology3
- Gap Analysis Program (U.S.)2
- Geographic Data Technology, Inc. (GDT)2
- U.S. Census Bureau. Geography Division1
- US Census Bureau, Geography Division1