Columbia subject headings:
Bałaszewicz, Julian Aleksander.
Espionage, Soviet.
Russia--Politics and government--1855-1881--Sources.
Harvard subject headings:
Bałaszewicz, Julian Aleksander.
Espionage, Russian
Russia--Politics and government--1855-1881--Sources.
Princeton subject headings:
Bałaszewicz, Julian Aleksander, 1831-
Espionage--Russia.
Russia--History--Alexander II, 1855-1881.