National milk sanitation act: hearings before the Committee on Interstate and Foreign Commerce, House of Representatives, Eighty-seventh Congress, first session, on H.R. 50, H.R. 51, H.R. 52, H.R. 53, H.R. 54, H.R. 55, H.R. 56, H.R. 57, H.R. 58, H.R. 59, H.R. 60, H.R. 1825, H.R. 5024, and H.R. 5928, bills to amend the Public Health Service act to protect the public from unsanitary milk and milk products shipped in interstate commerce, without unduly burdening such commerce. July 3l, August 1, and August 30, 1961.