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Author
- Geological Survey (U.S.)10
- International Steering Committee for Global Mapping (ISCGM)10
- National Geophysical Data Center10
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)8
- Canada Centre for Remote Sensing7
- Geological Survey of Canada.7
- Central Intelligence Agency6
- Anville, Jean Baptiste Bourguignon d', 1697-17824
- Hijmans, Robert J.4
- Kelso, Nathaniel Vaughn4
- National Atlas of the United States4
- Patterson, Tom4
- University of California, Berkeley. Museum of Vertebrate Zoology4
- Boas, Franz, 1858-1942.2
- Bouchette, Joseph2
- Canada. Minerals and Metals Sector.2
- Canada. Minerals.2
- Keefer, Thomas C., 1821-1915, cartographer.2
- Kitchin, Thomas, d. 17842
- Maclear & Co.2