Verona, A. Mondadori publisher, 1941. With color plates and illustrations, yellowed margins, color illustrated editorial paperback. § In the lot, numbers 5 and 7 of the magazine “La Lettura”, printed respectively in May and July 1937, illustrations in black and white and in color, editorial paperbacks illustrated in color. The May issue with the Munari cover and the 6 pages entitled What are useless machines and why, with text and 11 the intervention of the artist What are useless machines and why, text and photos of 11 useless machines; in the July issue, the speech by Munari Tipografia with text and 20 photos of photographic examples.