Hey everybody,
I'm conducting a research to help a group of military aviation history lovers to find more information about the Military Airspace structure and ATC procedures in the Soviet cold war era in eastern European Countries (Poland, Hungary,
Czechoslovakia etc.)
It's really difficult to find something (well, we know it's not the most disclosed topic in this world 
) but it doesn't have to be super detailed. If anyone here had some kind of experience or information, we would really appreciate
Thanks!
BTS