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Titles
- Letter from Jacques J. Bronfenbrenner, Washington University School of Medicine to Michael Heidelberger1
- Letter from James B. Conant, Office of Scientific Research and Development to Michael Heidelberger1
- Letter from Joshua Lederberg to Columbia University, College of Physicians and Surgeons, Office of the Registrar1
- Letter from Keyes D. Metcalf and Carl H. Milam to Alan Gregg1
- Letter from Max Delbruck to Salvador E. Luria1
- Letter from Michael Heidelberger to Jacques J. Bronfenbrenner, Washington University School of Medicine1
- Letter from Oswald T. Avery to Roy Avery (partial transcription)1
- Letter from Oswald T. Avery to Wendell M. Stanley1
- Letter from Philip Levine to Alexander S. Wiener1
- Letter from Richard F. Allen and George K. Strode to Robert D. Murphy1
- Letter from Robert D. Murphy to Richard F. Allen and George K. Strode1
- Letter from Simon Flexner to Michael Heidelberger1
- Letter from Willard C. Rappleye, Columbia University, Office of the Dean to Joshua Lederberg1