Emergency medical services systems development act of 1973, hearings before Subcommittee on Health, 93d Congress, 1st session, on S. 504 [and] S. 654, Jan. 31, and Feb. 1, 1973, Washington, D.C, Mar. 9, 1973, San Francisco, Calif., Mar. 12, 1973, Los Angeles, Calif.

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