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Cindy Blobaum
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Donna Latham
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Explore Electricity!
Carmella Van Vleet
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Canals and Dams: Investigate...
Donna Latham
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The Wind at Work: An Activity...
Gretchen Woelfle
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Robotics: Discover the...
Kathy Ceceri
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Bridges and Tunnels:...
Donna Latham
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Wind Power: 20 Projects to...
Clive Dobson
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