Columbia subject headings:
Atomic bomb--Soviet Union--History.
Nuclear physics--Research--Soviet Union--History.
Nuclear weapons--Soviet Union--History.
Harvard subject headings:
Atomic bomb--Soviet Union--History--Sources.
Nuclear physics--Research--Soviet Union--History--Sources.
Nuclear weapons--Soviet Union--History--Sources.
Princeton subject headings:
Atomic bomb--Soviet Union--History.
Nuclear weapons--Soviet Union--History.