Former Owner
- Margaret F. Woodward1
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Martinus Nijhoff1
- Mary Schell Collins1
- Mary W. T. Dickinson1
- Mary, Queen of Scots1
- Maurice Kann1
- Merlemont family1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minnis, Katherine1
- Monsieur de Bel Air1
- Morton Davis Mitchell1
- Mrs. F. W. Bartlett1
- Muriel Agnes Fry1
- Museo Cavaleri1
- Nicolas Rauch1
- Otto Ege1
- P. Pigeot1
- Paul Louis Feiss1