Pub. L. 94-165, tit. I, sec. 108

Sec. 108. Notwithstanding any other provision of law, persons have heretofore and may hereafter be employed or otherwise contracted with by the Secretary of the Interior to perform work occasioned by emergencies such as fire, flood, storm, or any other unavoidable cause and may be compensated at regular rates of pay without regard to Sundays, Federal holidays, and the regular workweek.