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Start Over You searched for: Languages English Remove constraint Languages: English Copyright Public domain Remove constraint Copyright: Public domain Publication Year 1958 Remove constraint Publication Year: <span class="single" data-blrl-single="1958">1958</span>

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1. Suggested procedure for potency testing of poliomyelitis vaccine: 18 November 1957

2. Letter from Joshua Lederberg to Arthur Kornberg

5. Letter from Leon A. Heppel to Maxine Singer

6. Letter from Leon A. Heppel to Maxine Singer

8. Letter from Joshua Lederberg to George W. Beadle

9. Letter from Joshua Lederberg to George W. Beadle

10. Letter from Joshua Lederberg to Edward L. Tatum