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Build your own electric motor (e-book)
	Price: $19
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Build your own compressed air BB machine gun (printed book)
	Price: $39 Price: $49 (including a key component kit)
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Build your own compressed air BB machine gun (e-book)
	Price: $18
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Build your own high temperature composite pulse jet (e-book)
	Price: $7
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Build your own styrofoam boat (e-book)
	Price: $9
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