Professor Albert Hopper, frog and Science Hero, travels with his niece Polly and nephew Tad throughout the solar system, exploring the sun, asteroids and comets, and the planets.
Series:
Albert Hopper science hero ; 2 Himmelman, John Albert Hopper science hero ; 2.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.