Columbia subject headings:
Europe, Eastern--Library resources--Congresses.
Soviet Union--Library resources--Congresses.
Harvard subject headings:
Acquisition of European publications--Congresses.
Book industries and trade--Europe, Eastern--Congresses.
Europe, Eastern--Bibliography--Methodology--Congresses.
Europe, Eastern--Information services--Congresses.
Europe, Eastern--Library resources--Congresses.
Libraries--Europe, Eastern--Special collections--Congresses.
Libraries--Slavic countries--Special collections--Congresses.
Slavic countries--Bibliography--Methodology--Congresses.
Slavic countries--Information services--Congresses.
Slavic imprints--Congresses.
Soviet Union--Library resources--Congresses.
Princeton subject headings:
Europe, Eastern--Library resources--Congresses.
Soviet Union--Library resources--Congresses.