Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Politics and government--21st century--Congresses.
Balkan Peninsula--Social conditions--21st century--Congresses.
Europe, Eastern--Politics and government--21st century--Congresses.
Europe, Eastern--Social conditions--21st century--Congresses.
Princeton subject headings:
Balkan Peninsula--Politics and government--21st century--Congresses.
Europe, Eastern--Politics and government--21st century--Congresses.