Former Owner
- Joseph E. Widener1
- Josephine Widener Wichfield1
- Julia Burgess1
- Kartause Erfurt1
- Lathrop Colgate Harper1
- Laurence William Hodson1
- Lawrence J. Schoenberg1
- Louis H. Silver1
- Léon Gruel1
- Maggs Bros Ltd3
- Mannheimer Hofbibliothek1
- Marie-François Duchesne de Beaumanoir2
- Mary W. T. Dickinson1
- Matthew Simpson Parkhurst1
- Michaeliskonvent1
- Mikhail Golitsyn1
- Milton Fischmann1
- Monasterio de El Paular1
- Nathan Comfort Starr1
- Nicholas Chevalier1