- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)4,882
- Héderváry, Claire de49
- Conquest, Robert18
- Tsentralnaia Studiia Dokumentalnykh Filmov (TsSDF)16
- Solzhenitsyn, Aleksandr Isaevich14
- Lennauchfilm13
- Medvedev, Roy Aleksandrovich13
- Samizdat Archives13
- Khrushchev, Nikita Sergeevich11
- Leningradskaia Studiia Dokumentalnykh Filmov (LSDF)10
- Lewytzkyj, Borys10
- Open Media Research Institute10
- Trotsky, Leon10
- Brzezinski, Zbigniew9
- Medvedev, Zhores A.9
- Open Society Archives at Central European University9
- Geller, Mikhail8
- Kennan, George F.7
- Nove, Alec7
- Radio Free Europe/Radio Liberty, Inc - Research Institute7