Columbia subject headings:
Harvard subject headings:
Book industries and trade--Germany--History--20th century.
Censorship--Germany--History--20th century.
Koehler & Volckmar--History.
National socialism and literature
National socialism.
Princeton subject headings:
Book industries and trade--Germany--History--20th century.
Koehler & Volckmar--History.
National socialism and literature--Germany.
National socialism--Germany.