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A guide to the use of visual aids/ L. S. Powell. English.

By: Powell, Leonard Sutherland.
Contributor(s): British Association for Commercial and Industrial Education.
Material type: materialTypeLabelBookPublisher: London: British Association for Commercial and Industrial Education, 1961Description: 36p.: ill.; 22 cm.Subject(s): Visual aidsDDC classification: 658.386:371.33
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