Publisher
- California. Department of Water Resources71
- California. Department of Fish and Game. Marine Resources Region67
- Geological Survey (U.S.)58
- National Atlas of the United States50
- U.S. Geological Survey41
- North American Cartographic Information Society15
- Bay Area Open Space Council4
- Calaveras County GIS3
- California. Division of Mines and Geology3
- County of Santa Cruz Information Services Department3
- National Geophysical Data Center3
- California Geological Survey2
- Canada Centre for Mapping2
- County of San Mateo Information Services Department2
- Environmental Systems Research Institute (Redlands, Calif.)2
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)2
- Jasper Ridge Biological Preserve (Agency)2
- Placer County Geographic Information Systems2
- Sacramento County GIS2
- Santa Clara Valley Water District (Calif.)2