%0 U.S. Federal Government Document %0 Print %0 Book %E United States. Congress. Senate. Committee on Rules and Administration %E United States. Canal Zone Biological Area, Barro Colorado Island %E National Zoological Park (U.S.) %I U.S. Govt. Print. Off. %D 1964 %C Washington, %G English %T Smithsonian Institution. Hearing before the Subcommittee on Rules and Administration, United States Senate, Eighty-eighth Congress, second session, on S. 808 [and others] ... May 6, 1964.