Columbia subject headings:
Harvard subject headings:
Press, Communist--Germany--Bibliography.
Press, Communist--Germany--History--20th century.
Underground literature--Germany--Bibliography.
Underground literature--Germany--History--20th century.
Princeton subject headings:
Press, Communist--Germany--Bibliography.
Press, Communist--Germany--History--20th century.
Underground literature--Germany--Bibliography.
Underground literature--Germany--History--20th century.