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- Environmental Systems Research Institute, Inc. (ESRI)91
- Hart Energy Publishing54
- Esri38
- ESRI37
- Platts20
- TTG, Inc.16
- Environmental Systems Research Institute (Redlands, Calif.)15
- Tele Atlas North America, Inc./Geographic Data Technology, Inc.10
- United States Geological Survey7
- Environmental Systems Research Institute (ESRI)5
- Tele Atlas North America, Inc.5
- Hart Energy3
- Federal Aviation Administration2
- Department of Commerce, Census Bureau1
- Geographic Data Technology, Inc1
- Geological Survey1
- Group 1 Software, Inc.1
- U.S. Geological Survey1