TY  - BOOK
AU  - Powell,Leonard Sutherland
ED  - British Association for Commercial and Industrial Education.
TI  - A guide to the use of visual aids,
SN  - 851710697
AV  - LB1043.5 .P87 1968
U1  - 371.33/5 
PY  - 1968///
CY  - London
PB  - British Association for Commercial and Industrial Education
KW  - Visual aids
N1  - Bibliography: p. 39-40
ER  -