Columbia subject headings:
Lusatia (Germany)--Relations--Russia.
Russia--Relations--Germany--Lusatia.
Sorbs--History.
Harvard subject headings:
Lusatia (Germany)--Relations--Russia.
Russia--Relations--Germany--Lusatia.
Sorbs--History.
Princeton subject headings:
Lusatia (Germany)--Relations--Russia.
Russia--Relations--Germany--Lusatia.
Sorbs--History.