Former Owner
- Louis XII of France1
- Ludwig Rosenthal1
- Luigi Arrigoni1
- Luigi Cora1
- Luis Ordoñez1
- Luther Albertus Brewer1
- Lutheran Theological Seminary at Philadelphia1
- M. Louise Stowell1
- Maksymilian Mielzynski1
- Mannheimer Hofbibliothek1
- Marcantonio Contarini1
- Marchese Linterno1
- Margaret Le Seigneur1
- Marguerite of Lorraine1
- Maria Riddell1
- Marie-François Duchesne de Beaumanoir1
- Martin Breslauer1
- Menno Hertzberger1
- Mercantile Library Company1
- Mitchell Starrett Buck1