TY  - GEN
AU  - Postlethwait, S. N. ; Mercer, F. V.
TI  - Integrated multi-media systems for science education (excluding television and radio broadcasts)
PY  - 1972///
CY  - Paris : 
PB  - Unesco
KW  - Audio-visual aids
KW  - Science
KW  - Education
ER  -