Hearings Before the Subcommittee on Health and the Environment of the Committee on Interstate and Foreign Commerce, House of Representatives, Ninety-sixth Congress, Second Session, on H.R. 7285 a Bill to Amend the Federal Food, Drug, and Cosmetic Act to Limit the Antibiotic Drugs which May be Used in Subtherapeutic Doses in Animal Feed, June 12 and 24, 1980