Columbia subject headings:
Germany--Relations--Poland--History--20th century--Congresses.
Poland--Relations--Germany--History--20th century--Congresses.
Reconciliation--Religious aspects--Christianity--Congresses.
Harvard subject headings:
Germany--Relations--Poland--History--20th century--Congresses.
Poland--Relations--Germany--History--20th century--Congresses.
Reconciliation--Religious aspects--Christianity--Congresses.
Princeton subject headings: