Columbia subject headings:
Harvard subject headings:
Communism--China--Manchuria.
Japanese communists.
Minami Manshū Tetsudō Kabushiki Kaisha. Chōsabu.
Sorge, Richard, 1895-1944
Princeton subject headings:
Communism--China--Manchuria.
Japanese communists.
Minami Manshū Tetsudō Kabushiki Kaisha. Chōsabu
Sorge, Richard, 1895-1944.