Former Owner
- Josiah H. Benton1
- Juana Mendel1
- Judith Lady Montefiore College4
- Julia Burgess12
- Julie Florence de Cossette1
- Julius de Cardelinis1
- K-L1
- Karen L. Gould9
- Karl F. Morrison1
- Karl Theodor Völcker's Verlag Und Antiquariat3
- Katherine Somerset Wyttenbach Fenwick5
- Keith Jarvis1
- Kenneth J. "Bud" Jennings2
- Lancino Curti1
- Lathrop C. Harper, Inc.5
- Lathrop Colgate Harper7
- Laura Hurd Motion1
- Laurence Claiborne Witten II2
- Laurence William Hodson1
- Lawrence J. Schoenberg8