Former Owner
- Breslauer and Meyer1
- Bruce P. Ferrini1
- Brudenell family1
- Budapest University of Jewish Studies1
- Burndy Library1
- Byron Reed1
- C.B1
- Caesareum Societatis Jesu Collegium Viennense1
- Carl Hermann Grabauer1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Morbio1
- Caxton Club1
- Chapelle du monastère du Carmel de Nantes1
- Charles Alexander de Cosson1
- Charles Bruce, 3rd Earl of Ailesbury1
- Charles Butler1
- Charles Fairfax Murray1
- Charles Hurleston1
- Charles Lenormand du Coudray1
- Charles Louis Adelaïde Henri Matheron Curnieu1