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Albert Hopper science hero

Himmelman, John
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.
Target Readership: