Hippo
Hippo is a publisher who has published at least 7 editions.
 Captain Underpants and the Attack of the Talking Toilets
| 1999 | 43 reads | 3.45 | |
 Claudia and the Mystery at the Museum
| 1993 | 3 reads | 3.5 | |
 Karen's Goldfish
| 1991 | 3 reads | 4 | |
 Megastar
| 1985 | 1 read | 0 | |
 The Mad Millennium: A Play
| 1999 | 1 read | 0 | |
 Best Friends for Frances
| 1969 | 3 reads | 3.5 | |
 A Baby Sister for Francis
| 1964 | 3 reads | 3.67 |