Former Owner
- Maggs Bros Ltd1
- Maksymilian Mielzynski1
- Margaret F. Woodward1
- Margaret Le Seigneur1
- Marguerite de Belleville1
- Marguerite of Lorraine1
- Marilyn Carbonell1
- Marion Lawrence1
- Mary Elizabeth Holte1
- Mary Schell Collins1
- Michel Chasles1
- Morot1
- Nicholas B. Scheetz1
- Otto Orren Fisher1
- Paul Durrieux1
- Paul Gottschalk1
- Peter Arrell Brown Widener1
- Peter Arrell Brown Widener II1
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1