Extension of health program authorities : hearings before the Subcommittee on Health and the Environment of the Committee on Interstate and Foreign Commerce, House of Representatives, Ninety-fifth Congress, first session on H.R. 3538, a bill to amend the Public Health Service Act to authorize appropriations for fiscal year 1978 for health planning and related programs : H.R. 3539, a bill to amend the Public Health Service Act to authorize appropriations for fiscal year 1978 for biomedical research programs : H.R. 3598, a bill to amend the Public Health Service Act, the Community Mental Health Centers Act, title V of the Social Security Act, and the program of assistance for home health services to authorize appropriations for fiscal year 1978 for health services programs, February 22, 23, and 24, 1977.