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Author
- Environmental Systems Research Institute (Redlands, Calif.)308
- Kelso, Nathaniel Vaughn131
- Patterson, Tom131
- National Geospatial-Intelligence Agency118
- Geological Survey (U.S.)104
- United States Geological Survey69
- Environmental Systems Research Institute, Inc. (ESRI)56
- Collins Bartholomew Ltd.49
- National Imagery and Mapping Agency45
- ESRI42
- United States. Bureau of Transportation Statistics37
- National Atlas of the United States and the United States Geological Survey36
- Esri30
- Harvard Geospatial Library29
- National Imagery and Mapping Agency (now National Geospatial-Intelligence Agency)28
- TomTom North America, Inc.25
- Economic and Social Research Institute (Reston, Va.)24
- United States. National Imagery and Mapping Agency22
- National Atlas of the United States21
- Smith, Walter H. F.19
