TY  - BOOK
AU  - Coppen, Helen
TI  - Aids to teaching and learning
SN  - 080129048
U1  - 371.33 21st ed.
PY  - 1969///
CY  - Oxford
PB  - Pergamon Press
KW  - Educational technology
KW  - Teaching-Aids and devices
N1  - pp 225-30
ER  -