Columbia subject headings:
Harvard subject headings:
Germans--Silesia, Lower (Poland and Germany)--Congresses.
Germans--Silesia--History--Congresses.
Germany--Civilization--Cross-cultural studies--Congresses.
Material culture--Silesia, Lower (Poland and Germany)--Congresses.
Silesia, Lower (Poland and Germany)--Civilization--Congresses.
Silesia, Lower (Poland and Germany)--Ethnic relations--Congresses.
Silesia, Lower (Poland and Germany)--History--Congresses.
Silesia--History--Congresses.
Princeton subject headings:
Germans--Silesia--History--Congresses.
Silesia--History--Congresses.