Publisher
- California. Department of Water Resources120
- California Geological Survey31
- California. Division of Mines and Geology14
- California. Dept. of Conservation.5
- Bay Area Open Space Council2
- Analyse Diachronique de l'espace Urbain Parisien: Approche Geomatique1
- County of Santa Cruz Information Services Department1
- Geological Survey (U.S.)1
- U.S. Fish and Wildlife Service1