Columbia subject headings:
Intelligence service--Germany--History.
Intelligence service--Soviet Union--History.
National socialism and occultism.
Occultism--Political aspects--Germany.
Scientific expeditions--China--Tibet Autonomous Region--History--20th century.
Harvard subject headings:
Intelligence service--Germany--History.
Intelligence service--Soviet Union--History.
National socialism and occultism.
Occultism--Political aspects--Soviet Union.
Scientific expeditions--China--Tibet Autonomous Region--History--20th century.
Princeton subject headings:
Intelligence service--History.