Former Owner
- Marguerite of Lorraine1
- Marie Ange-Toussaint Placide de Ferron1
- Marion H. Gottfried1
- Marion Lawrence1
- Martinus Nijhoff1
- Mary Elizabeth Holte1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Merlemont family1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minnis, Katherine1
- Monsieur de Bel Air1
- Morot1
- N. Pauli1
- Nettie Goldsmith Naumburg1
- Nicholas B. Scheetz1
- Norman H. Strouse1
- Oliver R. Barrett1
- Otto Orren Fisher1
- P. Pigeot1