Emergency medical services systems authorization : hearing before the Subcommittee on Health and the Environment of the Committee on Interstate and Foreign Commerce, House of Representatives, Ninety-sixth Congress, first session on H.R. 3039, a bill to extend for three fiscal years the program under section 789 and title XII of the Public Health Service Act relating to emergency medical services and to authorize assistance for poison control and assistance centers : H.R. 3124, a bill to extend expiring appropriation authorizations for emergency medical services systems and health information and promotion, and for other purposes : H.R. 2212, a bill to amend the Public Health Service Act to revise and extend title XII of that act relating to emergency medical services, March 21, 1979.