Overview
Ex-library Paperback in Good (G) condition. Light library markings, otherwise clean and straight.
Illus. in full color. "The unusual purple rock that Bob has found begins to talk, telling him that it fell out of a space ship and needs Bob's help to return to the planet Kal-dor. The subject matter will help lure problem readers and the simple vocabulary will keep them going. Vivid watercolors will add to children's enjoyment."--Booklist.