Columbia subject headings:
Cultural property--Germany--History--20th century--Congresses.
Cultural property--Poland--History--20th century--Congresses.
Historic preservation--Germany--History--20th century--Congresses.
Historic preservation--Poland--History--20th century--Congresses.
Harvard subject headings:
Cultural property--Germany--History--20th century--Congresses.
Cultural property--Poland--History--20th century--Congresses.
Historic preservation--Germany--History--20th century--Congresses.
Historic preservation--Poland--History--20th century--Congresses.
Princeton subject headings:
Cultural property--Germany--History--20th century--Congresses.
Cultural property--Poland--History--20th century--Congresses.
Historic preservation--Germany--History--20th century--Congresses.
Historic preservation--Poland--History--20th century--Congresses.