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How It Goes: Helicopters (How It Goes Books)
How It Goes Helicopters - How It Goes Books Author:Kate Scarborough, Simon Tegg Here's the story of helicopters, from their first working model in 1930 to the big, modern 'copters of the 1990s. Mr. Fixit shows their main parts--rotors, rotor heads, engines--and explains how pilots control them. Full color.