Former Owner
- M. Pierre Guarin1
- Maggs Bros Ltd1
- Mannheimer Hofbibliothek1
- Mary Bloch1
- Mary Lacaita1
- Mary Stanley, Countess of Derby1
- Mary W. T. Dickinson1
- Michael Greenberg1
- Mikhail Golitsyn1
- Mirmellus Arnandi1
- Monasterio de El Paular1
- Mrs. Turnbull1
- Nancy McGrath1
- Nicholas Herry1
- Oliver Henry Perkins1
- Oliver R. Barrett1
- Otto Orren Fisher1
- P. Desq1
- Park Abbey1
- Parke-Bernet1