Columbia subject headings:
Hallgarten, George W. F. (George Wolfgang Felix), 1901-1975.
Imperialism.
World politics--20th century.
Harvard subject headings:
Hallgarten, Georg Wolfgang Felix, 1901- .
Imperialism.
World politics--20th century
Princeton subject headings:
Hallgarten, George Wolfgang Felix, 1901-
Imperialism.
World politics--20th century.