Former Owner
- Melk Abbey1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Miguel de Mayora1
- Milt Freudenheim1
- Minerva Kaiser1
- Minnis, Katherine1
- Moissac Abbey1
- Monasterio de El Paular1
- Monastery of Our Lady of the Angels of Churubusco1
- Monsieur de Bel Air1
- Mortimer Frank1
- Mrs. F. W. Bartlett1
- Muriel Agnes Fry1
- N. Pauli1
- Nathaniel Sherman Bouton1
- Newman F. McGirr1
- Nicholas B. Scheetz1
- Nicholas Chevalier1
- Nicolas Antoine Labbey de Billy1
- Nicolas Rauch1