Sacramento-San Joaquin Delta Atlas
- About waterways, wetlands, water quality, agriculture and soil, flood control, ecological concerns, politics and population growth in this California region.
- http://rubicon.water.ca.gov/delta_atlas.fdr/daindex.html

Central Valley Bird Club
- Information about upcoming outings, regional lists of birds, links to Audubon Society and other birding sites, and minutes of the club's meetings.
- http://www.cvbirds.org/