A prior section
31e,
Pub. L. 102–285, § 6, May 18, 1992,
106 Stat. 170;
Pub. L. 105–36, § 3(d), Aug. 5, 1997,
111 Stat. 1110, provided for the preparation of a geologic mapping program implementation plan, prior to repeal by
Pub. L. 106–148, § 6, Dec. 9, 1999,
113 Stat. 1722.