. . "elating to arrests, sections 3, 4, 5, and 6 of the Act of May 26, 1930 (46 Stat. 381), as amended (16 U.S.C. 17b, 17c, 17d, and 17e), relating to services or other accommodations for the public, emergency supplies and services to concessioners, acceptability of travelers checks, care and removal of indigents, the Act of October 9, 1965 (79 Stat. 696; 16 U.S.C. 20???20g), relating to concessions, t" . .