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260. [Committee hearing] serial, 92d Congress. 71. National heart, blood vessel, lung, and blood act of 1972, hearings before Subcommittee on Public Health and Environment, 92d Congress, 2d session on H.R. 12571, H.R. 13715, H.R. 12460, H.R. 13500, S. 3323 (and identical bills), Apr. 25 and 26, 1972.