Columbia subject headings:
Harvard subject headings:
Academic libraries--Germany--Bonn--History--20th century.
Universitätsbibliothek Bonn--History--20th century.
Princeton subject headings:
Academic libraries--Germany--Bonn--History--20th century.
Libraries and national socialism--Germany--Bonn.
Universitäts- und Landesbibliothek Bonn--History--20th century.
Universitätsbibliothek Bonn--History--20th century.