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Stephanie Derkovitz
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- design and construction (5)
- juvenile literature (5)
- handicraft (4)
- readers (publications) (4)
- aeronautics (2)
- balloons (2)
- catapult (2)
- electronic alarm systems (2)
- experiments (2)
- flashlights (2)
- gums and resins, synthetic (2)
- light emitting diodes (2)
- models (2)
- rockets (aeronautics) (2)
- toy making (2)
- toys (2)
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