Columbia subject headings:
Katyn Massacre, Katynʹ, Russia, 1940.
Harvard subject headings:
Katyn Massacre, Katynʹ, Russia, 1940.
Poland--History--Occupation, 1939-1945
Princeton subject headings:
Katyn Massacre, Katynʹ, Russia, 1940.
Poland--History--Occupation, 1939-1945.