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- World Wildlife Fund (WWF)28
- World Wildlife Fund14
- Wood, Herbert11
- Circuit Rider Productions2
- Geological Survey (U.S.)2
- National Atlas of the United States2
- Tompkins County Planimetric Project2
- California. Metropolitan Transportation Commission1
- ESRI1
- Metro Data Resource Center1
- Tele Atlas North America, Inc.1
- Turner, W. J. (William John).1
- U.S. Department of Commerce U.S. Census Bureau Geography Division1
- U.S. Geological Survey1
- United States Geological Survey and the United States Environmental Protection Agency1