Each bill that is passed by the Legislature and approved by the Governor is assigned a chapter number by the Secretary of State in the order in which they become law. These chaptered bills are statutes, and ordinarily become part of the California Codes.
From A Guide for Accessing California Legislative Information on the Internet
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Once a bill is signed into law, the Office of Federal Regulation assigns it a Public Law number and Statute citation number. A Statute, also referred to as an Act, is the individual law and the number represents the order in which it became law. The text of the Public laws contain the following information:
Citation Example for a Statute: 119 STAT. 2171
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