SMITH, Siân
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Screws, Nuts, and Bolts
K-Gr 1–Each book covers a simple machine and reveals how it works, such as utilizing a screw or nut and bolt to hold a toy car or a jungle gym together...
Pulleys
K-Gr 1–Each book covers a simple machine and reveals how it works, such as utilizing a screw or nut and bolt to hold a toy car or a jungle gym together...
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