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Start Over Subjects Vaccine Potency ✖Remove constraint Subjects: Vaccine Potency Titles Suggested procedure for potency testing of poliomyelitis vaccine: 18 November 1957 ✖Remove constraint Titles: Suggested procedure for potency testing of poliomyelitis vaccine: 18 November 1957 Copyright Public domain ✖Remove constraint Copyright: Public domain Recently Added Within 6 Months ✖Remove constraint Recently Added: Within 6 Months Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999

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