Creator
- Napa County Conservation, Development Planning1
- National Energy Information Center (U.S.)1
- Nelson/Nygaard1
- Office of Emergency Services1
- Placer County1
- Sacramento County (Calif.) -- Department of Technology1
- Sacramento County GIS1
- Santa Clara County (Calif.). Planning Office1
- Shasta County (Calif.)--Planning Division1
- Tehama County Public Works1
- U.S. Census Bureau1
- U.S. Census Bureau. Geography Division1
- U.S. Fish and Wildlife Service1
- USGS1
- Uganda Bureau of Statistics1
- United States Geological Survey1
- United States. Bureau of Transportation Statistics1
- United States. National Marine Fisheries Service1
- Various sources1
- World Resources Institute1