Columbia subject headings:
History, Modern--20th century--Periodicals.
World history--Sources--Periodicals.
World politics--Periodicals.
Harvard subject headings:
History, Modern--20th century--Periodicals
World history--Sources--Periodicals.
World politics--Periodicals
Princeton subject headings:
History, Modern--20th century--Periodicals.
Periodicals.
World history--Sources--Periodicals.
World politics--Periodicals.