Columbia subject headings:
Catholic Church--Foreign relations--Poland--Sources.
Catholic Church--Poland--History--20th century--Sources.
Church and state--Poland--History--20th century--Sources.
Poland--Church history--20th century--Sources.
Poland--Foreign relations--Catholic Church--Sources.
Harvard subject headings:
Catholic Church--Foreign relations--Poland--Sources.
Catholic Church--Poland--History--20th century--Sources.
Church and state--Catholic Church--History--20th century--Sources.
Church and state--Poland--History--20th century--Sources.
Poland--Church history--20th century--Sources.
Poland--Foreign relations--Catholic Church--Sources.
Princeton subject headings:
Catholic Church--Foreign relations--Poland--Sources.
Catholic Church--Poland--History--20th century--Sources.
Church and state--Poland--History--20th century--Sources.
Poland--Church history--20th century--Sources.
Poland--Foreign relations--Catholic Church--Sources.