Former Owner
- Antiquarian Books of Boston3
- Baldassarre Boncompagni2
- Baptist Union Theological Seminary2
- Barbara Hackenmayrin1
- Bartholdus and Johann Flachmann1
- Basilica Gößweinstein1
- Basilios Bessarion1
- Bernard M. Rosenthal9
- Bernard Quaritch1
- Bernard Quaritch Ltd1
- Bernardo Mendel1
- Bertram Ashburnham, 4th Earl of Ashburnham2
- Bet din tsedeḳ London ṿeha-medinah1
- Birch & Son1
- Boies Penrose II1
- Bonaventura Brem1
- Branners Bibliofile Antikvariat1
- Bruce P. Ferrini1
- Burg Kreuzenstein1
- Buxheim Charterhouse6