A guide to the use of visual aids /
Powell, Leonard Sutherland
A guide to the use of visual aids / by L. S. Powell - 3nd ed. - London : British Association for Commercial and Industrial Education, 1970 - 36 p. : ill. ; 22 cm.
Bibliography: p. 39-40
Visual aids
A guide to the use of visual aids / by L. S. Powell - 3nd ed. - London : British Association for Commercial and Industrial Education, 1970 - 36 p. : ill. ; 22 cm.
Bibliography: p. 39-40
Visual aids
