Columbia subject headings:
Harvard subject headings:
Belgium--Boundaries--Germany.
Belgium--History--20th century.
Belgium--Relations--Germany.
Collective memory--Belgium.
Collective memory--Germany.
Collective memory--Netherlands.
Collective memory.
Germany--Boundaries--Belgium.
Germany--Boundaries--Netherlands
Germany--History--20th century.
Germany--Relations--Belgium.
Germany--Relations--Netherlands.
Netherlands--Boundaries--Germany.
Netherlands--History--20th century.
Netherlands--Relations--Germany.
World War, 1939-1945.
Princeton subject headings:
Belgium--History--20th century--Congresses.
Belgium--Relations--Germany--Congresses.
Germany--History--20th century--Congresses.
Germany--Relations--Belgium--Congresses.
Germany--Relations--Netherlands--Congresses.
Netherlands--History--20th century--Congresses.
Netherlands--Relations--Germany--Congresses.