Columbia subject headings:
Harvard subject headings:
Calonder, Felix.
Jews--Poland--History--20th century.
Jews--Silesia--History--20th century.
Katyn Massacre, Katynʹ, Russia, 1940.
Poland--Relations--Switzerland.
Switzerland--Relations--Poland.
Princeton subject headings:
Calonder, Felix.
Jews--Poland--History--20th century.
Jews--Silesia--History--20th century.
Katyn Massacre, Katynʹ, Russia, 1940.
Poland--Relations--Switzerland.
Switzerland--Relations--Poland.