- Paper: Off white to white
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- Front cover detached 30%. Back cover detached 10%.
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Volume 23, Issue 2 - December, 1939. Mechanical science and technology magazine. Features include an article on stop-motion animation, dresses made from milk, darkroom tricks and much more. 6 1/2-in. x 9 1/2-in., 146 pages, BW/spot color.
Cover price $0.10.