Coppen, Helen Aids to teaching and learning Helen Coppen - [1st ed.] - PERGAMON New York, PERGAMON [1969] - x, 230 p. illus. 20 cm Include bibliography ISBN: 0080129048 LCCN: 68009151 Subjects--Topical Terms: Audio-visual education LC Class. No.: LB1043 / .C656 1969 Dewey Class. No.: 371.33