1990—Pub. L. 101–313 inserted reference to Petroglyph National Monument.

1988—Pub. L. 100–567, which directed substitution of “Gila Cliff Dwellings National Monument, and Zuni-Cibola National Historical Park” for “and Gila Cliff Dwelling National Monument” was executed by making substitution for “and Gila Cliff Dwellings National Monument” as the probable intent of Congress.