- Radio Free Europe/Radio Liberty, Inc - Research Institute5
- Bortstieber, Gertrud4
- Pallai, Péter4
- Hanák, Péter3
- Samizdat Archives3
- Nóvé, Béla2
- Balkan Section1
- Balogh, Eva S.1
- Berdiaev, Nikolaĭ1
- Berlin, Isaiah1
- Bishop, Robert1
- British Broadcasting Corporation, Written Archive Centre1
- Ciechanowski, Jan1
- Communist International (Comintern)1
- Dean, Vera Micheles1
- Fischer, Ruth1
- Germany. Auswärtiges Amt1
- Gramophone Shop1
- Great Britain, Foreign and Commonwealth Office1
- Harris, Seymour Edwin1