9780606100434 | Demco Media, April 1, 1985, cover price $12.59 | About this edition: Explains the processes by which a hamburger and other foods are used to make energy, strong bones, and solid muscles as they pass through the digestive system.

9780606137485 | Demco Media, September 1, 1997, cover price $10.51 | About this edition: A retelling of the story about Romulus, the legendary founder of Rome, and his twin brother, Remus, who were raised with wolves

9780613866842 | Turtleback Books, December 1, 2002, cover price $17.20 | About this edition: Presents a biography of the woman who was born a slave with no status and became one of the most powerful voices in the abolitionist movement.

9781435272729 | Reprint edition (Paw Prints, May 9, 2008), cover price $14.99 | also contains Why Are the Ice Caps Melting?: The Dangers of Global Warming

9781417759125 | Turtleback Books, November 1, 2006, cover price $16.00 | About this edition: Offers budding ecologists information about how and why global warming is affecting the planet, what is the greenhouse effect, ways to recycle, and what young readers can do to help.

9780805076622 | 1 edition (Henry Holt Books for Young Readers, March 30, 2010), cover price $16.99