First Grade Engineering

Does This Use Electricity?
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How People Use Machines, Vol.1
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Where You Can See Big Machines, Vol.1
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Big Machines Do Many Things, Vol. 1
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Big Machines Do Many Things, Vol. 2
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Does This Have a Motor?
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There Are Many Kinds of Bridges
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How People Use Machines, Vol. 2
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Engineers Help Build Things, Vol. 1
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People Use Tools Every Day
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Are These Four Machines or Four Tools?
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