Section, act June 25, 1948, ch. 646, 62 Stat. 948, related to authentication and certification of copies of documents relating to land titles, by persons having custody of such of any foreign government or its agents, certification by an American minister or consul that they be true copies of the originals, the recording of such copies in the office of the General Counsel for the Department of the Treasury, and to the evidentiary value of such copies.