Former Owner
- Lydia Thompson Morris1
- Madame Théophile Belin1
- Maggs Bros Ltd1
- Maksymilian Mielzynski1
- Margaret F. Woodward1
- Margaret Le Seigneur1
- Marguerite de Fontenay1
- Marguerite of Lorraine1
- Marie Ange-Toussaint Placide de Ferron1
- Michel Chasles1
- Monsieur de Bel Air1
- Morot1
- Nicholas B. Scheetz1
- Otto Ege1
- P. Pigeot1
- Paul Gottschalk1
- Peter Arrell Brown Widener1
- Peter Arrell Brown Widener II1
- Petrus Hofstede1
- Philadelphia Rare Books & Manuscripts Company1