Channels of learning : the story of educational television /
Powell, John Walker, 1904-
Channels of learning : the story of educational television / John Walker Powell. - Washington : Public Affairs, c1962. - x, 178 p.
Educación--Estados Unidos
Enseñanza audiovisual
Channels of learning : the story of educational television / John Walker Powell. - Washington : Public Affairs, c1962. - x, 178 p.
Educación--Estados Unidos
Enseñanza audiovisual