(25 ILCS 135/5.01) (from Ch. 63, par. 29.1)
    Sec. 5.01. To establish in the State Capitol a reference bureau, which shall be open daily, except Saturdays, Sundays and legal holidays, and at other times when the General Assembly is in session, in which shall be collected and kept, in such manner as to be readily accessible, such laws, reports, books, periodicals, documents, catalogues, check-lists, digests, summaries of the laws of other states upon current legislation, and such other printed or written matter as may aid the members of the General Assembly in the performance of their official duties.
(Source: Laws 1965, p. 2527.)