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Titles
- Letter from Barbara McClintock to Charles R. Burnham16
- Letter from Alton Ochsner to Michael E. DeBakey11
- Letter from Barbara McClintock to Curt Stern7
- Letter from Linus Pauling to Warren Weaver7
- Letter from O. O. R. Schwidetzky to Michael E. DeBakey5
- Letter from Kai O. Pedersen to Michael Heidelberger4
- Letter from Marguerite Stein to Florence R. Sabin4
- Letter from Michael E. DeBakey to his father, Shaker4
- Letter from Ralph M. Waters to Virginia Apgar4
- Letter from Roger S. Greene to Alan Gregg4
- Letter from Charles R. Drew to Lenore (Robbins) Drew3
- Letter from Alan Gregg to Walter B. Cannon2
- Letter from Alan Gregg to his wife2
- Letter from Barbara McClintock to Curt and Evelyn Stern2
- Letter from Catharine Macfarlane to Florence R. Sabin2
- Letter from Charles A. Doan to Florence R. Sabin2
- Letter from Charles R. Burnham to Barbara McClintock2
- Letter from Claude Forkner to Florence R. Sabin2
- Letter from Elvin A. Kabat to Michael Heidelberger2
- Letter from F. Elisabeth Crowell to Alan Gregg2