Public health monographs. 50. United States-U. S. S. R. medical exchange missions, 1956, microbiology and epidemiology: pt. 1, Visit of Soviet poliomyelitis team to United States, Jan. 18-Feb. 22, 1956; pt. 2, American medical mission on microbiology and epidemiology to Soviet Union, Feb. 27-Mar. 28, 1956.

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