- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)3,667
- Radio Free Europe/Radio Liberty, Inc - Research Institute20
- Samizdat Archives20
- Csákó, Mihály15
- Đorđević, Aleksandar13
- Soviet Red Archives10
- Nóvé, Béla8
- Visnews8
- UPTIN7
- Samizdat Archives of Radio Free Europe6
- Open Media Research Institute5
- Tsentralnaia Studiia Dokumentalnykh Filmov (TsSDF)5
- Hegedüs, András4
- Medvedev, Roy Aleksandrovich4
- Pallai, Péter4
- Ukrainskaia Studiia Khronikalno-dokumentalnykh Filmov4
- Ajtony, Árpád3
- Grigorenko, P. G.3
- Hanák, Péter3
- Hungarian Ministry of the Interior3