Source: L. 71: R&RE, p. 448, § 1. C.R.S. 1963: § 40-6-301. L. 83: Entire section amended, p. 695, § 6, effective June 15. L. 86: Entire section amended, p. 770, § 8 effective July 1. L. 90: Entire section amended, p. 1025, § 7, effective July 1. L. 2000: (2) amended, p. 1847, § 32, effective August 2. L. 2003: (2) amended, p. 2514, § 2, effective June 5.