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Start Over You searched for: Formats Text Remove constraint Formats: Text Publication Year 1950 to 1959 Remove constraint Publication Year: <span class="from" data-blrl-begin="1950">1950</span> to <span class="to" data-blrl-end="1959">1959</span>

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

3. Letter from Paul Berg to Francis Crick

4. Letter from Francis Crick to Paul Berg

5. Letter from Francis Crick to Paul Berg

7. Letter from James D. Watson to Francis Crick