Columbia subject headings:
Balkan Peninsula--History--19th century.
Balkan Peninsula--Relations--Poland.
Poland--Relations--Balkan Peninsula.
Harvard subject headings:
Balkan Peninsula--History--19th century.
Balkan Peninsula--Relations--Poland.
Poland--Relations--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--Relations--Poland.
Poland--Relations--Balkan Peninsula.
Polish people--Balkan Peninsula.