9780399241987 | Putnam Pub Group, February 1, 2004, cover price $15.99 |
About this edition: Humphrey, pet hamster at Longfellow School, learns that he has an important role to play in helping his classmates and teacher.
9780080287720, titled "Condensers: Theory and Practice" | Pergamon Pr, September 1, 1983, cover price $93.00 | also contains
Condensers: Theory and Practice
9780142403525 | Reprint edition (Puffin, May 5, 2005), cover price $5.99 |
About this edition: Sent to live in Room 26, Humphrey, the class hamster, begins to learn a lot about humans through simple observation from his cage, in an amusing tale about a curious creature who takes full advantage of his educational opportunities.
9780606346139 | Demco Media, May 5, 2005, cover price $14.53 |
About this edition: 'The time had arrived to put my Plan into action.
9781435287785 | Reprint edition (Paw Prints, May 22, 2008), cover price $14.99
9781417675326 | Turtleback Books, May 5, 2005, cover price $16.00 |
About this edition: Humphrey, pet hamster at Longfellow School, learns that he has an important role to play in helping his classmates and teacher.