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Collection includes:Peeking Under the City- Tap into kids' natural curiosity by pulling back the curtain on the below-ground workings of a typical big city. High-density, fun-to-explore illustrations and inviting text showcase water and sewer systems, transport lines and more.Peeking Underground- What about the world we can't see? The world underground? Soil and rock layers, plant roots, animal burrows, insects, and more take the spotlight in this book, thanks to fun-to-explore, detailed illustrations and inviting text.Peeking Under the Bonnet- It's all about teamwork: one part of a car working with another to make the car go. From the engine to the exhaust system, steering to braking, this book explains it all with fun-to-explore, detailed illustrations and informative text.Peeking Under Your Skin- This book fascinates kids with what lies right under their own skin. Fun-to-explore, high-density illustrations and informative text make the circulatory system, digestive system, a...