SMS dit: Optometry : hearings before Subcommittee no. 4 of the Committee on the District of Columbia, House of Representatives, Eighty-ninth congress, second session, on H.R. 12937, H.R. 13049, H.R. 13155, H.R. 13176, H.R. 13583, H.R. 13623, and H.R. 13821, H.R. 13917, H.R. 14941, and H.R. 15071 to regulate the practice of optometry in the District of Columbia. March 21, 22, 23, and May 31, 1966.