Time without clocks; how nature tells time, by Albert Piltz and Roger VanBever.

By: Piltz, Albert, 1915-Contributor(s): VanBever, Roger [joint author.]Material type: TextTextReference number: 00013608Publication details: New York, Grosset & Dunlap [1970] Description: 128 p. illus. 24 cmSubject(s): Biological rhythms -- Juvenile literatureDDC classification: 574/.01 LOC classification: QH527 | .P54
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