A guide to overhead projector /
Powell, Leonard Sutherland
A guide to overhead projector / by Len Powell - London : British Association for Commercial and Industrial Education, 1974 - 32 p. : ill. ; 21 cm.
Overhead projection
Transparencies
A guide to overhead projector / by Len Powell - London : British Association for Commercial and Industrial Education, 1974 - 32 p. : ill. ; 21 cm.
Overhead projection
Transparencies
