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1
From sundials to atomic clocks : understanding time and frequency
[Gaithersburg, Md.?] : Washington, DC : U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology ; For sale by the Supt. of Docs., U.S. G.P.O., 1999
1999 ed.Format: Government Document Book
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2
From sundials to atomic clocks : understanding time and frequency
[Washington] :; Washington, DC : Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs. U.S. Govt. Print. Off,; National Bureau of Standards, 1977Format: Government Document Book
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3
From sundials to atomic clocks : understanding time and frequency
[Washington] : [National Bureau of Standards, U.S. Dept. of Commerce] : For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977Format: Government Document Book