Columbia subject headings:
Europe, Central--Civilization--Congresses.
Europe, Central--Ethnic relations--Congresses.
Europe--Civilization--Slavic influences--Congresses.
Harvard subject headings:
Europe, Central--Civilization--Congresses.
Europe, Central--Ethnic relations--Congresses.
Europe--Civilization--Slavic influences--Congresses.
Princeton subject headings:
Europe, Eastern--Civilization.
Europe, Eastern--Ethnic relations.
Slavic countries--Civilization.
Slavic countries--Ethnic relations.