Columbia subject headings:
Agriculture--Research--Germany--History.
Kaiser Wilhelm-Gesellschaft zur Förderung der Wissenschaften.
National socialism and science--Germany--History.
Plant breeding--Research--Germany--History.
Science and state--Germany--History.
Harvard subject headings:
Agriculture--Research--Germany--History.
Kaiser Wilhelm-Gesellschaft zur Förderung der Wissenschaften
National socialism and science--Germany--History.
Plant breeding--Research--Germany--History.
Science and state--Germany--History.
Princeton subject headings: