Former Owner
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marino Grimani1
- Mariota Lyle1
- Martinus Nijhoff1
- Mary Schell Collins1
- Maurice Kann1
- Maximilian Henry of Bavaria1
- Maxwell Sommerville1
- Michele Cavaleri2
- Milton Fischmann1
- Monsieur de Bel Air1
- Mrs. F. W. Bartlett1
- Muriel Agnes Fry1
- Nicholas Chevalier1
- Nicolas Rauch1
- Nicolas Yemeniz1
- Notre-Dame monastery (Ambert, France)1
- Omaha Public Library1
- Otto Ege2
- Paul Gruel1