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- U.S. Geological Survey28
- United States. Bureau of the Census. Geography Division20
- Bay Area Open Space Council19
- Geological Survey (U.S.)18
- County of Santa Cruz Information Services Department6
- Humboldt County Planning and Building Department6
- Santa Clara Valley Water District (Calif.)4
- Analyse Diachronique de l'espace Urbain Parisien: Approche Geomatique3
- Sacramento County GIS3
- United States. Bureau of Transportation Statistics3
- California. Department of Fish and Game. Marine Resources Region2
- Environmental Systems Research Institute (Redlands, Calif.)2
- National Atlas of the United States2
- California. Metropolitan Transportation Commission1
- Monterey County (Calif.)1
- Santa Clara County (Calif.). Planning Office1
- U.S. Fish and Wildlife Service1