Columbia subject headings:
Bli︠u︡mkin, I︠A︡kov Grigorʹevich.
Espionage, Russian--China--Tibet Autonomous Region.
Espionage--Soviet Union--History--20th century.
Roerich Central Asian Expedition (1923-1928)
Soviet Union. Narodnyĭ komissariat vnutrennikh del.
Harvard subject headings:
Russian language--China--Tibet Autonomous Region--History.
Russian language--Espionage, Soviet.
Russian language--Soviet Union--History--1917-1936.
Princeton subject headings:
Bli︠u︡mkin, I︠A︡kov Grigorʹevich.
Espionage, Russian--China--Tibet.
Espionage--Soviet Union--History--20th century.
Roerich Central Asian Expedition (1923-1928)
Soviet Union. Narodnyĭ komissariat vnutrennikh del