Sounds you cannot hear. [electronic resource] Illustrated by John Kaufmann.

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TextSeries: P-H junior research booksPublication details: Englewood Cliffs, N.J., Prentice-Hall [1963]Description: 69 p. illus. 22 cmSubject(s):

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Summary: Explains the principles of sound, ultrasonic sound, radar, and sonar and discusses how certain birds and fish use ultrasonics to guide them.

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Explains the principles of sound, ultrasonic sound, radar, and sonar and discusses how certain birds and fish use ultrasonics to guide them.

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