- Bibliography Division267
- Bibliography Division, Library of Congress29
- Bibliography, Division of18
- Bills and Resolutions, Select Committee on Introduction of1
- Biochemic Division11
- Biological Laboratory, Woods Hole35
- Biological Laboratory, Woods Hole (Fisheries Bureau, Commerce and Labor Department)1
- Biological Survey Bureau1,200
- Biological Survey Bureau (Agriculture Department)22
- Biological Survey Division96
- Biological Survey, Bureau of9
- Biological Survey, Division of24
- Bituminous Coal Commission4
- Bituminous Coal Consumers' Counsel27
- Bituminous Coal Division213
- Blind-Made Products, Committee on Purchases of29
- Block Signal and Train Control Board12
- Board of Appeals on Visa Cases1
- Board of Ordnance and Fortification3
- Board of Review of Construction1