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    Why We Need Water and Fiber
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    Wild and Pet Puppies
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    2.9   | 
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    Wildlife in the City (4 titles)
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    Winding Around: The Screw
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    4.5   | 
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    Wolf, Coyote, and Other Packs
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    Wolf Family Adventures
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    4.1   | 
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    Wonderful Whales
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    5.4   | 
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    Woolly Mammoth
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    Working with Materials (4 titles)
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    Yellowstone National Park
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    4.5   | 
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    Yo soy un ser vivo (I am a living thing)
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    3.6   | 
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    You Need Rest to be at Your Best!
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    3.7   | 
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    Your Brain: Understanding Your Body's Control Center
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    Your Breathtaking Lungs and Rocking Respiratory System
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    6.0   | 
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    Your Brilliant Body! (6 titles)
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    Your Changing Brain: A Guidebook
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    Your Growing Body and Remarkable Reproductive System
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    5.9   | 
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    Your Growling Guts and Dynamic Digestive System
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    6.0   | 
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    Your Guide to Electricity and Magnetism
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    Your Guide to Life on Earth
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    Your Guide to the Periodic Table
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    Your Hardworking Heart and Spectacular Circulatory System
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    6.0   | 
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    Your Mind-Bending Brain and Networking Nervous System
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    5.8   | 
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    Your Strong Skeleton and Amazing Muscular System
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    5.8   | 
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