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$29.95	$22.95

Sound

G. Hansen

This title explains what sound is and how it travels in waves. It will also explain what pitch and loudness is, and how humans hear it. It is complete with carefully chosen photographs and labeled diagrams to help visual learners. Gr. K-3

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Full-color Photographs Glossary Index 24 pages 11-1/4" x 9-1/4" ©20