Columbia subject headings:
Neutrality--United States--Bibliography.
Pacifism--United States--History--20th century--Bibliography.
United States--Foreign relations--20th century--Bibliography.
Harvard subject headings:
Neutrality--United States--Bibliography.
Pacifism--United States--History--20th century--Bibliography.
United States--Foreign relations--20th century--Bibliography.
Princeton subject headings:
Neutrality--United States--History--20th century--Bibliography.
Pacifism--United States--History--20th century--Bibliography.
United States--Foreign relations--20th century--Bibliography.