TY  - BOOK
AU  - Powell,John Walker
TI  - Channels of learning: the story of educational television 
AV  - LB1043 P6.3
PY  - 1962///
CY  - Washington
PB  - Public Affairs
KW  - Educación
KW  - Estados Unidos
KW  - Enseñanza audiovisual
ER  -