Columbia subject headings:
Cologne (Germany)--History--20th century.
Cologne (Germany)--Politics and government.
National socialism--Germany--Cologne.
Harvard subject headings:
Bonsen, Rudolf zur, 1886-1952.
Cologne (Germany)--History--20th century.
Cologne (Germany)--Politics and government.
Diels, Rudolf, 1900-1957
National socialism--Germany--Cologne.
Nazis--Germany--Cologne--Biography.
Presidents--Germany--Cologne--Biography.
Reeder, Eggert, 1894-1959.
Princeton subject headings:
Cologne (Germany)--History--20th century.
Cologne (Germany)--Politics and government.
National socialism--Germany--Cologne.