Columbia subject headings:
Harvard subject headings:
Atomic bomb--History--20th century.
Atomic bomb--Safety measures--History--20th century.
History, Modern--20th century
Nuclear disarmament--History--20th century.
Nuclear warfare--History--20th century.
Princeton subject headings:
Atomic bomb--History--20th century.
Atomic bomb--Safety measures--History--20th century.
History, Modern--20th century.
Nuclear disarmament--History--20th century.
Nuclear warfare--History--20th century.