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Author
- Environmental Systems Research Institute (Redlands, Calif.)19
- Platts19
- Tele Atlas B.V.19
- Angela E. England, Bat Conservation International, Inc.14
- Geological Survey (U.S.)11
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)10
- Canada Centre for Remote Sensing8
- Central Intelligence Agency8
- L'Isle, Guillaume de, 1675-17268
- National Geophysical Data Center8
- Bolton, Mr. (S.)6
- Homann Erben (Firm)6
- Ortelius, Abraham, 1527-15986
- Clark, William, 1770-18385
- Council on Foreign Relations. Independent Task Force on North America5
- ESRI5
- Tele Atlas North America, Inc.5
- World Wildlife Fund (WWF)5
- Cóvens et Mortier4
- Danckerts, Justus, 1635-17014