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E-book
Crazy Contraptions: Build Rube Goldberg Machines that Swoop, Spin, Stack, and Swivel: with Hands-On Engineering Activities
deLaura PerdewE-book
Biodiversity: Explore the Diversity of Life on Earth with Environmental Science Activities for Kids
deLaura PerdewE-book
Extinction: What Happened to the Dinosaurs, Mastodons, and Dodo Birds? With 25 Projects
deLaura Perdew