Columbia subject headings:
Harvard subject headings:
Audio-visual education--France--Marly-le-Roi--History--20th century.
Closed-circuit television--France--Marly-le-Roi--History--20th century.
Education--Experimental methods
Educational technology--France--Marly-le-Roi--History--20th century.
Media programs (Education)--France--Marly-le-Roi--History--20th century.
Television in education--France--Marly-le-Roi--History--20th century.
Princeton subject headings:
Audio-visual education--France--Marly-le-Roi--History.