2 U.S.C. § 164
Index and digest of State legislation; preparation
The Librarian of Congress is authorized and directed to prepare biennially an index to the legislation of the States of the United States enacted during the biennium, together with a supplemental digest of the more important legislation of the period.
( Feb. 10, 1927, ch. 99, § 1 , 44 Stat. 1066 ; Feb. 28, 1929, ch. 367, § 1 , 45 Stat. 1398 .)