Columbia subject headings:
Balkan Peninsula--Economic conditions--20th century--Periodicals.
Balkan Peninsula--Politics and government--1989---Periodicals.
Black Sea Region--Economic conditions--20th century--Periodicals.
Black Sea Region--Politics and government--20th century--Periodicals.
Geopolitics--Balkan Peninsula--Periodicals.
Geopolitics--Black Sea Region--Periodicals.
Harvard subject headings:
Balkan Peninsula--Economic conditions--20th century--Periodicals.
Balkan Peninsula--Politics and government--1989---Periodicals.
Black Sea Region--Economic conditions--20th century--Periodicals.
Black Sea Region--Politics and government--20th century--Periodicals.
Geopolitics--Balkan Peninsula--Periodicals.
Geopolitics--Black Sea Region--Periodicals.
Princeton subject headings:
Balkan Peninsula--Economic conditions--20th century--Periodicals.
Balkan Peninsula--Politics and government--1989---Periodicals.
Black Sea Region--Economic conditions--20th century--Periodicals.
Black Sea Region--Politics and government--20th century--Periodicals.
Geopolitics--Balkan Peninsula--Periodicals.
Geopolitics--Black Sea Region--Periodicals.
Periodicals.