Columbia subject headings:
Germans--Europe, Central--History--Congresses.
Germans--Europe, Eastern--History--Congresses.
Germany--Ethnic relations--Congresses.
Return migration--Germany--History--Congresses.
Harvard subject headings:
Germans--Europe, Central--History--Congresses.
Germans--Europe, Central--History.
Germans--Europe, Eastern--History--Congresses.
Germans--Europe, Eastern--History.
Germany--Ethnic relations--Congresses.
Return migration--Germany--History--Congresses.
Return migration--Germany--History.
Princeton subject headings:
Germans--Europe, Central--History--Congresses.
Germans--Europe, Eastern--History--Congresses.
Germany--Ethnic relations--Congresses.
Return migration--Germany--History--Congresses.