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ANNUAL POLIOMYELITIS CASE AND DEATH RATES IN STATES REPORTING BOTH CASES AND DEATHS UNITED STATES, 1910-1954 50 A. ARITHMETICAL RATE SCALE 40 30 CASE RATE 20 10 DEATH RATE o 1910 1915 1920 1925 1930 1935 1940 1945 1950 YEARS 3

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