Training of physicians, dentists, and professional public health personnel : hearings before the Committee on Interstate and Foreign Commerce, House of Representatives, Eighty-seventh Congress, second session, on H.R. 4999, H.R. 8774, and H.R. 8833, bills to increase the opportunities for training of physicians, dentists, and professional public health personnel, and for other purposes, January 23, 24, 25, 26, and 30, 1962.