Columbia subject headings:
Acculturation--Europe, Eastern.
Black market--Europe, Eastern--History--20th century.
Europe, Eastern--Description and travel.
Europe, Eastern--Relations.
Freedom of movement--Europe, Eastern.
Harvard subject headings:
Acculturation--Europe, Eastern.
Black market--Europe, Eastern--History--20th century.
Europe, Eastern--Relations.
Freedom of movement--Europe, Eastern.
Travel--Europe, Eastern--History--20th century.
Travel--History--20th century.
Princeton subject headings: