- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)2,543
- Karabasz, Kazimierz4
- Hoffman, Jerzy3
- Skórzewski, Edward3
- Ślesicki, Władysław3
- Borowik, Włodzimierz2
- Kosiński, Bohdan2
- Kot, Stanisław2
- Kowalik, Jan2
- Pallai, Péter2
- Radio Free Europe/Radio Liberty, Inc - Research Institute2
- Alfred A. Reisch1
- Beck, Józef1
- Bednarczyk, Czesław1
- Bieńkowska, Danuta1
- Biskupski, Stefan1
- Bossak, Jerzy1
- Bregman, Aleksander1
- Bridge, Ann1
- British Broadcasting Corporation, Written Archive Centre1