Columbia subject headings:
Balkan Peninsula--Commerce--History.
Balkan Peninsula--Economic conditions.
Land use--Balkan Peninsula--History.
Taxation--Balkan Peninsula--History.
Harvard subject headings:
Balkan Peninsula--Commerce--History.
Balkan Peninsula--Economic conditions.
Land use--Balkan Peninsula--History.
Taxation--Balkan Peninsula--History.
Princeton subject headings:
Balkan Peninsula--Commerce--History.
Balkan Peninsula--Economic conditions.
Land use--Balkan Peninsula--History.
Taxation--Balkan Peninsula--History.