Powell, Leonard Sutherland.
A guide to the use of visual aids/ English. L. S. Powell. - London: British Association for Commercial and Industrial Education, 1961. - 36p.: ill.; 22 cm.
Visual aids.
658.386:371.33 / POW
A guide to the use of visual aids/ English. L. S. Powell. - London: British Association for Commercial and Industrial Education, 1961. - 36p.: ill.; 22 cm.
Visual aids.
658.386:371.33 / POW