Columbia subject headings:
Harvard subject headings:
Libraries and national socialism--Germany--Berlin--Congresses.
Library science--Germany--Berlin--History--20th century--Congresses.
Staatsbibliothek zu Berlin--Preussischer Kulturbesitz--History--Congresses.
Princeton subject headings:
Libraries and national socialism--Germany--Berlin--Congresses.
Library science--Germany--Berlin--History--20th century--Congresses.
Staatsbibliothek zu Berlin--Preussischer Kulturbesitz--History--Congresses.