Columbia subject headings:
Katyn Massacre, Katynʹ, Russia, 1940--Sources.
Katyn Massacre, Katynʹ, Russia, 1940.
Harvard subject headings:
Katyn Massacre, Katynʹ, Russia, 1940--Sources.
Katyn Massacre, Katynʹ, Russia, 1940.
Princeton subject headings:
Katyn Massacre, Katynʹ, Russia, 1940--Sources.
World War, 1939-1945--Atrocities--Soviet Union--Sources.