- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)1,344
- Radio Free Europe/Radio Liberty, Inc - Research Institute22
- Samizdat Archives20
- Csákó, Mihály16
- Tsentralnaia Studiia Dokumentalnykh Filmov (TsSDF)13
- Soviet Red Archives10
- Nóvé, Béla8
- Lennauchfilm7
- Leningradskaia Studiia Dokumentalnykh Filmov (LSDF)6
- Open Media Research Institute5
- Samizdat Archives of Radio Free Europe5
- Ukrainskaia Studiia Khronikalno-dokumentalnykh Filmov5
- Pallai, Péter4
- Pastor, Peter4
- Philipp, Tibor4
- Tsentrnauchfilm4
- De Nooijer, Paul3
- Hanák, Péter3
- Hungarian Ministry of the Interior3
- Radio Free Europe and Radio Liberty, Inc.3