- Letter from Otto Westphal to Joshua Lederberg2
- Letter from Richard Wolfgang to Joshua Lederberg2
- Letter from Robert Waldinger to Joshua Lederberg2
- Letter from S. Gaylen Bradley to Joshua Lederberg2
- Letter from Salvador E. Luria to the editor of The New York Times2
- Letter from Sewell Champe to Francis Crick2
- Letter from Seymour H. Hutner to Joshua Lederberg2
- Letter from Stephen Fazekas, John Curtin School of Medical Research to Joshua Lederberg2
- Letter from T. C. Carter to Joshua Lederberg2
- Letter from Thomas C. Nelson to Joshua Lederberg2
- Letter from Tracy M. Sonneborn to M. Demerec2
- Letter from William Hayes to Joshua Lederberg2
- Letter from Wolfram Heumann to Joshua Lederberg2
- Letter to Doctor A. Brigham, on animal magnetism: being an account of a remarkable interview between the author and Miss Loraina Brackett while in a state of somnambulism2
- Letter to ladies, in favor of female physicians for their own sex2
- Lexicon medicum, or, Medical dictionary: containing an explanation of the terms in anatomy, physiology, practice of physic, materia medica, chemistry, pharmacy, surgery, midwifery, and the various branches of natural philosophy connected with medicine : selected, arranged, and compiled, from the best authors2
- Lilly's hand book of pharmacy and therapeutics2
- List of invitees to 1991 RMP History conference2
- Local laboratory service: approved laboratories2
- MOLGEN: A Computer Science Application to Molecular Genetics2