The University of California Berkeley Library has been a full depository for California documents since 1945, and houses California documents going back to the founding of the state in 1850. Most of this material can be found by using Oskicat (see box below for tips on using the Oskicat) or Melvyl. This guide to California Government provides easy access to the full text of recent California bills, (their status, history, votes & analyses), selected Elections data, and California Statistical sources. It is also a starting point for more historical publications from the state of California.
Oskicat can be very helpful in finding California government information. The best strategy is to use Oskicat's Advanced Keyword Search tab. Once at the Advanced Keyword Search screen, change the first drop-down to Author and enter California into the box next to it.
Leave the remaining boxes as Any Field and enter your search terms in those boxes (think of broad search terms for this step). You may also change the second box to Author and add the name of a particular agency to find publications from that agency. You also have the option to limit by date at the bottom of the search page, or UCB library location if needed.