Columbia subject headings:
Harvard subject headings:
Ethnocentrism--Germany--Friesland--History--20th century.
Ethnocentrism--Silesia--History--20th century.
Nationalism--Germany--Friesland--History--20th century.
Nationalism--Silesia--History--20th century.
Princeton subject headings:
Ethnocentrism--Germany--Friesland--History--20th century.
Ethnocentrism--Silesia--History--20th century.
Nationalism--Germany--Friesland--History--20th century.
Nationalism--Silesia--History--20th century.