Former Owner
- Ampleforth Abbey1
- Andreas Weiss1
- Angèle Louise Maggi Spaulding1
- Anna Vremans1
- Baldassarre Boncompagni1
- Barbara Hackenmayrin1
- Bartholdus and Johann Flachmann1
- Basilios Bessarion1
- Bernard Quaritch1
- Bernard Quaritch Ltd1
- Bernardo Mendel1
- Bertram Ashburnham, 4th Earl of Ashburnham1
- Bet din tsedeḳ London ṿeha-medinah1
- Birch & Son1
- Boies Penrose1
- Bonaventura Brem1
- Branners Bibliofile Antikvariat1
- Bruce P. Ferrini1
- Burg Kreuzenstein1
- Caesareum Societatis Jesu Collegium Viennense1