Columbia subject headings:
Authors, European--20th century--Political and social views--Congresses.
Authors, German--20th century--Political and social views--Congresses.
Peace--Congresses.
Harvard subject headings:
Authors, European--20th century--Political and social views--Congresses.
Authors, German--20th century--Political and social views--Congresses.
Nuclear disarmament--Congresses
Peace--Congresses
Princeton subject headings: