Columbia subject headings:
Cipher and telegraph codes.
Orhanizat︠s︡ii︠a︡ ukraïnsʹkykh nat︠s︡ionalistiv--Communication systems.
Postage stamps--Ukraine--History.
Ukraïnsʹka povstansʹka armii︠a︡--Communication systems.
Ukraïnsʹka povstansʹka armii︠a︡--Signalmen--History.
Harvard subject headings:
Insurgency--Ukraine--History--20th century.
Orhanizat︠s︡ii︠a︡ ukraïnsʹkykh nat︠s︡ionalistiv--Communication systems.
Ukrainian resistance movement, 1944-1954
Ukraïnsʹka povstansʹka armii︠a︡--Communication systems.
Ukraïnsʹka povstansʹka armii︠a︡--Postal service.
World War, 1939-1945--Underground movements--Ukraine.
Princeton subject headings: