- Is a Blue Whale the Biggest Thing There Is? 223 copies, 9 reviews
- What's Smaller Than a Pygmy Shrew? 189 copies, 6 reviews
- How Do You Lift a Lion? 148 copies, 1 review
- Can You Count to a Googol? 87 copies, 2 reviews
- How Do You Know What Time It Is? (Albert Whitman Prairie Books) 64 copies, 1 review
- Did a Dinosaur Drink This Water? (Albert Whitman Prairie Books) 52 copies, 12 reviews
- What's Faster Than a Speeding Cheetah? 50 copies
- What's So Special about Planet Earth? 25 copies
- Why Do Elephants Need the Sun? (Robert E. Wells Science) 21 copies, 3 reviews
- Polar Bear, Why Is Your World Melting? 21 copies, 1 review
- What's Older Than a Giant Tortoise? (Robert E. Wells Science) 13 copies
- Can We Share the World with Tigers? (Wells of Knowledge Science) 6 copies, 1 review
- Can You Count a Googol? 1 copy
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