Columbia subject headings:
Harvard subject headings:
Germans--Poland--Wrocław--History--Encyclopedias.
Wrocław (Poland)--Biography--Encyclopedias.
Wrocław (Poland)--Civilization--Encyclopedias.
Wrocław (Poland)--History--Encyclopedias.
Princeton subject headings:
Wrocław (Poland)--Civilization--Encyclopedias.
Wrocław (Poland)--History--Encyclopedias.