Columbia subject headings:
Bulgaria--Periodicals.
Greece--Periodicals.
Romania--Periodicals.
Turkey--Periodicals.
Yugoslavia--Periodicals.
Harvard subject headings:
Bulgaria--Periodicals.
Greece--Periodicals.
Romania--Periodicals.
Turkey--Periodicals.
Yugoslavia--Periodicals.
Princeton subject headings:
Bulgaria--Surveys.
Directories--Europe.
Europe--History.
Greece--Surveys.
Romania--Surveys.
Turkey--Surveys.
Yugoslavia--Surveys.