Engineering

Are These Four Machines or Four Tools?
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Engineers Help Build Things, Vol. 1
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How People Use Machines, Vol.2
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Machines That Move People, Vol. 1
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People Use Many Different Machines, Vol. 1
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People Used Tools Every Day
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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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Bridges
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Can You See These Tools?
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Counting Tools
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Did People Make This? Vol. 1
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Does This Have a Motor?
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How People Use Machines, Vol.1
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I See One Tool
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I See Tools
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Ned Sees Big Machines
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People Made This, Vol. 1
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People Make Things
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There Are Many Kinds of Bridges
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These Are All Machines, Vol. 1
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Where Is This Machine? Vol.1
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Where Is This Machine? Vol.2
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Where You Can See Big Machines, Vol.1
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