Columbia subject headings:
Adult education--Germany--History.
Adult education--Poland--History.
Germany--Relations--Poland.
Poland--Relations--Germany.
Harvard subject headings:
Adult education--Germany--History.
Adult education--Poland--History.
Germany--Relations--Poland
Poland--Relations--Germany
Princeton subject headings:
Adult education--Germany--History.
Adult education--Poland--History.
Germany--Relations--Poland.
Poland--Relations--Germany.