The Pu’uhonua o H?naunau National Historical Park shall be administered by the Secretary of the Interior subject to the provisions of the Act of August 25, 1916 (39 Stat. 535; 16 U.S.C., 1946 edition, secs. 1-4),¹ as amended and supplemented, and such additional authority compatible therewith as is contained in the Act of August 21, 1935 (49 Stat. 666; 16 U.S.C., 1946 edition, secs. 461-467),¹ with regard to preservation of historic sites and objects of national significance.