Columbia subject headings:
Civilization, Slavic--Congresses.
Imperialism--Congresses.
Harvard subject headings:
Civilization, Slavic--Congresses.
Europe, Central--Politics and government--Congresses.
Europe, Eastern--Politics and government--Congresses.
Imperialism--Congresses
Slavic countries--Politics and government--Congresses.
Princeton subject headings:
Europe, Central--Politics and government--Congresses.
Europe, Eastern--Politics and government--Congresses.
Imperialism--Congresses.
Slavic countries--Politics and government--Congresses.