Columbia subject headings:
German language--Europe, Central--History.
German language--Europe, Eastern--History.
German language--Poland--History.
Germans--Europe, Central--History.
Germans--Europe, Eastern--History.
Germans--Poland--History.
Harvard subject headings:
German language--Europe, Central--History.
German language--Europe, Eastern--History.
German language--Poland--History.
Germans--Europe, Central--History.
Germans--Europe, Eastern--History.
Germans--Poland--History
Princeton subject headings:
German language--Europe, Central--History.
German language--Europe, Eastern--History.
German language--Poland--History.
Germans--Europe, Central--History.
Germans--Europe, Eastern--History.
Germans--Poland--History.