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"The California Ballot Measures Database is a comprehensive, searchable source of information on California ballot propositions and initiatives from 1911 to the present. It includes the full text of individual ballot propositions, accompanying information contained in the ballot pamphlets, related legal and legislative history, and pdfs of the full ballot pamphlets. For ballot initiatives, it contains the full text of the individual initiatives, accompanying material relating to their filing & qualification, related legal and legislative history, and pdfs of related official documents."
The California Secretary of Statewebsite has information on ballot measures including Qualified Statewide Ballot Measures, Initiative and Referendum Qualification Status, How to Qualify an Initiative, Referendum, Resources and Historical Information, Voter Information Guides, and Initiative and Referendum Proposals Pending Review By Attorney General.