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Titles
- Letter from A. T. McCormack to Thomas Parran1
- Letter from Alan Gregg to Leonard Colebrook1
- Letter from Barbara McClintock to Curt Stern2
- Letter from Charles Seymour to Alan Gregg1
- Letter from E. B. Fred to Edward L. Tatum1
- Letter from Elvin A. Kabat to Michael Heidelberger1
- Letter from Florence B. Seibert to Florence R. Sabin1
- Letter from Florence R. Sabin to Rudolph J. Anderson1
- Letter from George W. Beadle to Edward L. Tatum2
- Letter from Linus Pauling to Warren Weaver2
- Letter from Samuel Hamilton to Lawrence Kolb1
- Letter from Virginia Apgar to Allen O. Whipple1