- Balkan Section1
- Balogh, Eva S.1
- Barát, Endre1
- Basseches, Nikolaus1
- Beck, F.1
- Belügyminisztérium Központi Irattára1
- Billʹ-Belotserkovskii, V.1
- Bogdanov, N.1
- Bornstein, Joseph1
- British Broadcasting Corporation, Written Archive Centre1
- Brogan, D. W.1
- Budapest. Fővárosi Szabó Ervin Könyvtár1
- Bulgarian Unit1
- Carr, Edward Hallett1
- Chiaureli, Mikhail1
- Colvin, Ian Goodhope1
- Communist International (Comintern)1
- Cornforth, Maurice Campbell1
- Custine, Astolphe1
- Czechoslovak Unit1