Columbia subject headings:
Harvard subject headings:
Espionage--Poland--History--20th century.
Military intelligence--Poland--History--20th century.
Princeton subject headings:
Poland--History, Millitary--1918-.
Russo-Polish War, 1919-1920.
Sabotage--Poland--History--20th century.
Special forces (Military science)--Poland--History--20th century.
Subversive activities--Poland--History--20th century.