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Publisher
- Canada Centre for Mapping and Earth Observation325
- Platts25
- Environmental Systems Research Institute, Inc. (ESRI)18
- Environmental Systems Research Institute (Redlands, Calif.)15
- DMTI Spatial Inc.10
- ESRI10
- Tele Atlas North America, Inc.6
- Geological Survey (U.S.)4
- University of California, Berkeley. Museum of Vertebrate Zoology4
- North American Cartographic Information Society3
- EEnvironmental Systems Research Institute (Redlands, Calif.)1
- GfK GeoMarketing GmbH1
- National Atlas of the United States1
- Parks Canada1
- Rand McNally & Company1