Columbia subject headings:
Harvard subject headings:
Blake, George, 1922-2020
Espionage, Soviet.
Felfe, Heinz, 1918-
Fuchs, Klaus Emil Julius, 1911-1988
Philby, Kim, 1912-1988.
Princeton subject headings:
Blake, George, 1922-2020.
Felfe, Heinz, 1918-
Fuchs, Klaus Emil Julius, 1911-1988.
Philby, Kim, 1912-1988.
Spies--Soviet Union.