- Bicycle trails--Oregon--Portland--Maps1
- Bicycle trails--Switzerland--Maps2
- Bicycle trails--Texas--Maps1
- Black Sea Region--Maps2
- Bladensburg, Battle of, Bladensburg, Md., 1814--Maps1
- Block diagrams--Belgium1
- Block diagrams--France1
- Block diagrams--Friuli (Italy : Province)1
- Block diagrams--Germany--Rhineland1
- Block diagrams--Istria (Croatia and Slovenia)1
- Boardinghouses--Germany--Munich--Maps1
- Boats1
- Boats and boating1
- Boston and Maine Railroad--Maps1
- Boston and Providence Railroad Corporation--Maps1
- Botany --South America.1
- Boundaries3
- Boundaries--Balkan Peninsula--Maps1
- Boundaries--Balkan Peninsula--Russo-Turkish War, 1877-18781
- Boundaries--China--Maps1
Libraries & Collections
- Arts Library
- Bass Library
- Beinecke Library
- Classics Library
- Divinity Library
- Film Study Center
- Fortunoff Archive
- Humanities Collections
- International Collections
- Law Library
- Lewis Walpole Library
- Library Collection Services
- Manuscripts & Archives
- Map Collection
- Marx Science & Social Science Library
- Medical Library
- Music Library
- Sterling Library
- Yale Center for British Art
