Locate the bill and all its versions to assess changes to the bill's language during the legislative process.
Studying the bill in all its versions is one of the best sources of legislative intent. Additions and deletions are indicated by italics and strikeout type. The text of each version is preceded by the Legislative Counsel’s Digest which summarizes changes. Some bills include a statement of intent or policy, which might be omitted in the codified version.
California legislative bills are available in microfiche for the years 1963 to 2004, and are located in Cabinets #21-22 the Micrographics Room.
The Documents Department at the San Francisco Public Library has California bills from 1867-current.