Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--History--20th century.
Business enterprises--Europe, Central--History.
Business enterprises--Europe, Eastern--History.
Europe, Central--Commerce.
Germany--Economic conditions.
Germany--Economic policy--1933-1945.
Germany--Foreign relations--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--History--20th century.
Europe, Central--Commerce.
Germany--Foreign relations--Balkan Peninsula.