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The subject index to the bills is bound with them through 1969. The index to 1970 and following is found in: Legislative Digest and History of Bills of the Senate and House of Representatives. In the Legislative Digest and History of Bills, you can find subject and topical indexes as well as detailed tables of contents (including, for example, "Bills Introduced by Members", alphabetical lists of members and the numbers for the bills they introduced).
WA State Governor Christine Gregoire signing Senate Bill 6239 into law, February 13, 2012.
Image courtesy of the Washington State Governor's Office.