Columbia subject headings:
Libraries--Germany (East)--History.
Libraries--Germany (West)--History.
Harvard subject headings:
Libraries--Germany (East)--History.
Libraries--Germany (West)--History.
Libraries--Germany--History--20th century.
Library cooperation--Germany--History--20th century.
Princeton subject headings:
Libraries--Germany (East)--History.
Libraries--Germany (West)--History.
Libraries--Germany--History--20th century.
Library cooperation--Germany--History--20th century.