Columbia subject headings:
Arnhold, Karl, 1884-
Education and state--Germany--History.
Vocational education--Germany--History.
Harvard subject headings:
Arnhold, Karl Robert, 1884-
Education and state--Germany--History.
Vocational education--Germany--History.
Princeton subject headings:
Arnhold, Karl Robert, 1884-
Education and state--Germany--History.
Vocational education--Germany--History.