"powell, len . "
a guide to the overhead projector: / len.. powell - 2 ed. - uk : bacie 1974. - ", 31p.; 21 cm."
621. 389 52 pow
a guide to the overhead projector: / len.. powell - 2 ed. - uk : bacie 1974. - ", 31p.; 21 cm."
621. 389 52 pow