Titles
- Letter from Elvin A. Kabat to Michael Heidelberger1
- Letter from F. W. Clement to Virginia Apgar1
- Letter from Florence R. Sabin to Charles A. Doan1
- Letter from Fred L. Soper to Wilbur A. Sawyer1
- Letter from Lawrence Kolb to A. Cecil Snyder1
- Letter from Lawrence Kolb to Lloyd H. Ziegler1
- Letter from Lawrence Kolb to Thomas Parran1
- Letter from Lawrence Kolb to Walter Treadway1
- Letter from Linus Pauling to H. D. Springall1
- Letter from Linus Pauling to Warren Weaver1
- Letter from Max Delbruck, California Institute of Technology to Michael Heidelberger1
- Letter from Michael Heidelberger to Max Delbruck, California Institute of Technology1
- Letter from Pierre Lecomte du Nouy, Societe Philomathique de Paris to Oswald T. Avery1
- Letter from Ralph M. Waters to Virginia Apgar1
- Letter from Rudolph J. Anderson to Florence R. Sabin1
- Letter from Thomas Parran to A. B. Chandler1
- Letter from Thomas Parran to Lawrence Kolb1
- Letter from Virginia Apgar to F. W. Clement1
- Letter from Walter Treadway to Lawrence Kolb1
- Martin Rodbell in Study of Rabbi Israel 'Bar-Mitzvah Boy'1