Measurement of time and tests of timepieces / U.S. Bureau of Standards.
|Corporate Author:||United States.|
Washington, D.C. : Govt. Print. Off., 1914.
<1st ed.> Issued December 1, 1914.
Clocks and watches.
Time > Systems and standards.
S. W. Stratton, director.
At head of title: Department of Commerce ...
39 p., 1 plate. :
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