Columbia subject headings:
Harvard subject headings:
Adult education--Germany--History--20th century.
Education--Germany--History--20th century
Educators--Germany--Biography
Flitner, Wilhelm, 1889-1990.
Youth movements--Germany--History--20th century.
Princeton subject headings:
Adult education--Germany--History--20th century.
Education--Germany--History--20th century.
Educators--Germany--Biography.
Flitner, Wilhelm, 1889-1990.
Youth movements--Germany--History--20th century.