Columbia subject headings:
Librarians--Germany--History--20th century--Congresses.
Libraries and national socialism--Congresses.
Library science--Political aspects--Germany--History--20th century--Congresses.
Research libraries--Political aspects--Germany--History--20th century--Congresses.
Research library directors--Germany--History--20th century--Congresses.
Harvard subject headings:
Librarians--Germany--History--20th century--Congresses.
Libraries and national socialism--Congresses.
Libraries and state--Germany--History--20th century--Congresses.
Library science--Political aspects--Germany--History--20th century--Congresses.
Research libraries--Germany--History--20th century--Congresses.
Research library directors--Germany--History--20th century--Congresses.
Princeton subject headings:
Librarians--Germany--History--20th century--Congresses.
Libraries and national socialism--Congresses.
Libraries and state--Germany--History--20th century--Congresses.
Library science--Political aspects--Germany--History--20th century--Congresses.
Research libraries--Germany--History--20th century--Congresses.
Research library directors--Germany--History--20th century--Congresses.