TY  - BOOK
AU  -  Crocker,A.H.
ED  -  Educational Foundation for Visual Aids (Great Britain).
TI  -  Supplement to a survey of overhead projectors / 
SN  -  0900553014
U1  -  P 371.3352 CRO 
PY  - 1969///
CY  -  London : 
PB  -  National Committee for Audio-Visual Aids in Education; E ducational Foundation for Visual Aids, 
KW  -  Projectors
KW  -  Overhead projection
ER  -