9781582461540 | Tricycle Pr, August 26, 2005, cover price $14.99 |
About this edition: Provides an introduction to the Fibonacci sequence and its presence in the animal world, including the equiangular spiral of a sundial shell, a parrot's beak, a hawk's talon, and a ram's horn.
9781582463247 | Tricycle Pr, July 27, 2010, cover price $7.99 |
About this edition: 1, 1, 2, 3, 5, 8, 13, 21, 34.