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Princeton University Library Catalog
From sundials to atomic clocks : understanding time and frequency / by James Jespersen and Jane Fitz-Randolph ; illustrated by John Robb.
[Washington : National Bureau of Standards, U. S. Dept. of Commerce] : for sale by the Supt. of Docs., U. S. Govt. Print. Off., 1977.
vii, 175 p. : ill. ; 28 cm.
Clocks and watches
National Bureau of Standards monograph, 155
Bibliography: p. 170.
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