Columbia subject headings:
Harvard subject headings:
Education and state--Germany--North Rhine-Westphalia--History--20th century.
Education--Germany--North Rhine-Westphalia--History--20th century.
Educational law and legislation--Germany--North Rhine-Westphalia--History--20th century.
Princeton subject headings:
Education and state--Germany (West)--North Rhine-Westphalia--History--20th century.
Education--Germany (West)--North Rhine-Westphalia--History--20th century.
Educational law and legislation--Germany (West)--North Rhine-Westphalia--History--20th century.