Columbia subject headings:
Bilingualism--Germany--Upper Lusatia--Religious aspects--Congresses.
Upper Lusatia (Germany)--Church history--Congresses.
Upper Lusatia (Germany)--Religious life and customs--Congresses.
Harvard subject headings:
Catholic Church--Germany--Upper Lusatia--History--Congresses.
Christianity and culture--Germany--Upper Lusatia--Congresses.
Church and state--Germany--Upper Lusatia--History--Congresses.
Sorbs--Germany--Upper Lusatia--Religion--Congresses.
Sorbs--Germany--Upper Lusatia--Religious life and customs--Congresses.
Upper Lusatia (Germany)--Church history--Congresses.
Upper Lusatia (Germany)--Ethnic relations--Congresses.
Princeton subject headings:
Catholic Church--Germany--Upper Lusatia--History--Congresses.
Christianity and culture--Germany--Upper Lusatia--Congresses.
Church and state--Germany--Upper Lusatia--History--Congresses.
Sorbs--Germany--Upper Lusatia--Religion--Congresses.
Sorbs--Germany--Upper Lusatia--Religious life and customs--Congresses.
Upper Lusatia (Germany)--Church history--Congresses.
Upper Lusatia (Germany)--Ethnic relations--Congresses.