- Radio Free Europe/Radio Liberty, Inc - Research Institute19
- Soviet Red Archives8
- Samizdat Archives5
- Pallai, Péter4
- Bortstieber, Gertrud3
- Csákó, Mihály3
- Hanák, Péter3
- Balogh, Eva S.2
- Bíró, András2
- Nóvé, Béla2
- Open Media Research Institute2
- Open Society Archives at Central European University2
- Alfred A. Reisch1
- Analytic Research Department1
- Balkan Section1
- British Broadcasting Corporation, Written Archive Centre1
- Bulgarian Unit1
- Constitutional and Legal Policy Institute at OSI-Budapest1
- Czechoslovak Unit1
- Fic, Victor M.1