Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--21st century--Congresses.
Peace--History--Congresses.
Peace-building--Germany--History--Congresses.
Peace-building--History--Congresses.
Princeton subject headings:
Peace--International cooperation--Congresses.
Peace-building--International cooperation--Congresses.
Security, International--International cooperation--Congresses.
World politics--20th century--Congresses.
World politics--21st century--Congresses.