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Piltz, Albert, 1915-

Time without clocks; how nature tells time, by Albert Piltz and Roger VanBever. - New York, Grosset & Dunlap [1970] - 128 p. illus. 24 cm.

LCCN: 68029983 /AC

Subjects--Topical Terms:
Biological rhythms--Juvenile literature.

LC Class. No.: QH527 / .P54

Dewey Class. No.: 574/.01