Columbia subject headings:
Harvard subject headings:
Technical education--Germany--History--19th century--Sources.
Technical education--Germany--History--20th century--Sources.
Trade schools--Germany--History--19th century--Sources.
Princeton subject headings:
Technical education--Germany--History--19th century--Sources.
Technical education--Germany--History--20th century--Sources.
Trade schools--Germany--History--19th century--Sources.