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Author
- Cao, Changyong15
- Earle, Carville15
- Heppen, John15
- Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology.15
- National Atlas of the United States15
- Otterstrom, Samuel15
- Geological Survey (U.S.)12
- Platts4
- Arndt, Raymond E.2
- Bawiec, Walter J.2
- Beikman, Helen M.2
- Godt, Jonathan W.2
- King, Philip B.2
- Schruben, Paul G.2
- Blackburn, Laura1
- Canada Centre for Mapping1
- Eastern Energy Resource Surveys Team (Geological Survey)1
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- Lannoo, Michael J.1