Columbia subject headings:
Harvard subject headings:
Sorbs--European Union countries.
Sorbs--Germany--History--19th century.
Sorbs--Germany--History--20th century.
Sorbs--Legal status, laws, etc.--Germany (East)
Sorbs--Legal status, laws, etc.--Germany (West)
Princeton subject headings:
Sorbs--European Union countries.
Sorbs--Germany--History--19th century.
Sorbs--Germany--History--20th century.
Sorbs--Legal status, laws, etc.--Germany (East).
Sorbs--Legal status, laws, etc.--Germany (West).