Columbia subject headings:
Internment camps--Soviet Union--History.
Katyn Massacre, Katynʹ, Russia, 1940.
Kozelʹsk (Russia : Concentration camp)--History.
Nazi concentration camps--Soviet Union--History.
Ostashkov (Russia : Concentration camp)--History.
Polish people--Crimes against--Soviet Union.
Political purges--Soviet Union--History.
Secret service--Officials and employees--Soviet Union--Biography.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History.
Starobilʹsʹk (Ukraine : Concentration camp)--History.
World War, 1939-1945--Atrocities--Soviet Union.
Harvard subject headings:
Katyn Massacre, Katynʹ, Russia, 1940.
Massacres--Soviet Union.
Poland--Foreign relations--Soviet Union
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Atrocities--Soviet Union.
Princeton subject headings:
Katyn Massacre, Katynʹ, Russia, 1940.
Massacres--Soviet Union.
Poland--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Atrocities--Soviet Union.