Titles
- Letter from A. Felix to Joshua Lederberg11
- Letter from A. H. Doermann to Joshua Lederberg1
- Letter from A. H. Doermann to Salvador E. Luria1
- Letter from A. H. Sturtevant to Joshua Lederberg2
- Letter from A. I. Oparin to Joshua Lederberg1
- Letter from A. J. Bateman, Christie Hospital & Holt Radium Institute to Joshua Lederberg2
- Letter from A. J. Kluyver to Joshua Lederberg2
- Letter from A. J. Kluyver to Perry W. Wilson1
- Letter from A. J. Kluyver to W. H. Peterson1
- Letter from A. J. Metcalfe to Joshua Lederberg1
- Letter from A. J. Riker to the Friends of Clarence S. Hean1
- Letter from A. J. Salle to Joshua Lederberg1
- Letter from A. K. Garven to Joshua Lederberg1
- Letter from A. L. Kappus to Joshua Lederberg2
- Letter from A. Lima-de-Faria to Joshua Lederberg1
- Letter from A. M. James to Joshua Lederberg1
- Letter from A. M. Pappenheimer, Jr. to Alden H. Emery, American Chemical Society1
- Letter from A. M. Pappenheimer, Jr. to Joshua Lederberg1
- Letter from A. R. Gopal-Ayengar to Joshua Lederberg3
- Letter from A. R. Gopal-Ayengar to Joshua and Esther Lederberg1