A guide to the overhead projector
Powell, Leonard Sutherland
A guide to the overhead projector by Len Powell - 2nd ed. - London British Association for Commercial and Industrial Education 1970 - 32 p. : ill. ; 22 cm.
0851710107
Lantern projection
Transparencies
A guide to the overhead projector by Len Powell - 2nd ed. - London British Association for Commercial and Industrial Education 1970 - 32 p. : ill. ; 22 cm.
0851710107
Lantern projection
Transparencies
