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Titles
- Letter from A. T. McCormack to Thomas Parran1
- Letter from Alan Gregg to Elton Mayo1
- Letter from Alan Gregg to H. H. Dale1
- Letter from Alan Gregg to Harvey Cushing1
- Letter from Alan Gregg to Hugh Crichton-Miller1
- Letter from Alan Gregg to Leonard Colebrook1
- Letter from Alan Gregg to Mark May1
- Letter from Alan Gregg to Walter B. Cannon2
- Letter from Alan Gregg to William Palmer1
- Letter from Alan Gregg to his wife2
- Letter from Alexander Makinsky to Alan Gregg1
- Letter from Allen O. Whipple to Virginia Apgar1
- Letter from Alton Ochsner to Michael E. DeBakey11
- Letter from Austin Brues to Clarence Dennis1
- Letter from Barbara McClintock to Charles R. Burnham16
- Letter from Barbara McClintock to Curt Stern7
- Letter from Barbara McClintock to Curt and Evelyn Stern2
- Letter from Carl E. Buck to Louis Dublin1
- Letter from Catharine Macfarlane to Florence R. Sabin2
- Letter from Charles A. Doan to Florence R. Sabin2