Frog--and Science Hero--Professor Albert Hopper travels with his niece Polly and nephew Tad to the center of the Earth, encountering prehistoric cavefrogs, dinosaur fossils, and Yeti on the way.
Ages 6-8. Henry Holt and Company.|||Grades K-1. Henry Holt and Company.|||juvenile
John Himmelman.
Accelerated Reader AR MG 3.4 1 508352.
