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file U (Stack)How It Works
How It Works
The A to Z of invention, science and technology with thousands of fascinating diagrams and photographs: A Marshall Cavendish encyclopaedia in 98 weekly parts. Part 8, 1974. London: Marshall Cavendish Limited, 1974. (Includes articles on Balances, Ballista, Balloon, and Barometer).
[1974-34]
1974