TY  - BOOK
T1  - Audio-visual materials of instruction;
DA  - 1949.
CY  - Chicago,
AU  - Henry, Nelson B.
CN  - LB5
CN  - LB5
PB  - Univ. of Chicago Press,
PP  - Chicago,
PY  - 1949.
ID  - 93958
KW  - Visual education.
TI  - Audio-visual materials of instruction;
ER  -