- Is a Blue Whale the Biggest Thing There Is? 271 copies, 11 reviews
- What's Smaller Than a Pygmy Shrew? 216 copies, 7 reviews
- How Do You Lift a Lion? 171 copies, 3 reviews
- Can You Count to a Googol? 105 copies, 5 reviews
- How Do You Know What Time It Is? (Albert Whitman Prairie Books) 75 copies, 2 reviews
- Did a Dinosaur Drink This Water? (Albert Whitman Prairie Books) 61 copies, 19 reviews
- What's Faster Than a Speeding Cheetah? 55 copies, 1 review
- What's So Special about Planet Earth? 31 copies
- Why Do Elephants Need the Sun? (Robert E. Wells Science) 28 copies, 3 reviews
- Polar Bear, Why Is Your World Melting? 23 copies, 1 review
- What's Older Than a Giant Tortoise? (Robert E. Wells Science) 18 copies, 2 reviews
- Can We Share the World with Tigers? (Wells of Knowledge Science) 6 copies, 1 review
Robert E. Wells (unknown)
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