Creator
- Environmental Systems Research Institute (Redlands, Calif.)6
- Geological Survey (U.S.)5
- United States. Bureau of the Census. Geography Division4
- Zambia. Survey Department4
- County of San Mateo Information Services Department3
- Mongolia. Ulsyn Geodezi, Zurag Zu̇ĭn Gazar2
- California Regional Water Quality Control Board--San Francisco Bay Region1
- California. Department of Fish and Game. Marine Resources Region1
- San Francisco Estuary Institute1
- United States Geological Survey1