Columbia subject headings:
Sorbs.
Upper Lusatia (Germany)--History--Revolution, 1848-1849.
Harvard subject headings:
Sorbs--Germany--Upper Lusatia.
Upper Lusatia (Germany)--History.
Princeton subject headings:
Sorbs--Germany--Upper Lusatia.
Upper Lusatia (Germany)--History--Revolution, 1848-1849.