Former Owner
- Karl Leopold Strauven1
- Karl Theodor Völcker's Verlag Und Antiquariat3
- Karl Wilhelm Hiersemann8
- Kartause Erfurt2
- Katherine Petersen1
- Katherine Somerset Wyttenbach Fenwick8
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Keith Jarvis4
- Kenneth Hyde1
- Kenneth J. "Bud" Jennings2
- Klaus Dieter Dahmen1
- Kloster Bredelar1
- Kloster Kuringen1
- Kloster Rebdorf2
- Kulturhistorisches Museum Magdeburg1
- L. C. Harper1
- L. Paganthus1
- Lady Margaret Ayloffe1
- Lajos Graf Apponyi de Nagy-Appony1
- Lambach Abbey3