- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)1,356
- Karabasz, Kazimierz4
- Ślesicki, Władysław3
- Borowik, Włodzimierz2
- Hoffman, Jerzy2
- Kosiński, Bohdan2
- Kowalik, Jan2
- Pallai, Péter2
- Radio Free Europe/Radio Liberty, Inc - Research Institute2
- Skórzewski, Edward2
- Alfred A. Reisch1
- Bednarczyk, Czesław1
- Bossak, Jerzy1
- Bregman, Aleksander1
- Bridge, Ann1
- British Broadcasting Corporation, Written Archive Centre1
- Brock, Peter1
- Brzozowski, Andrzej1
- Brzozowski, Jarosław1
- Bujnowski, Józef1