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The national measurement system for time and frequency /
Allan S. Risley.

APA Citation

Risley, A. S., United States. National Bureau of Standards. (1976). The national measurement system for time and frequency. [Washington, D.C.]: U.S. Dept. of Commerce, National Bureau of Standards .

MLA Citation

Risley, A. S, and United States. National Bureau of Standards. The National Measurement System for Time And Frequency. [Washington, D.C.]: U.S. Dept. of Commerce, National Bureau of Standards , 1976.

Warning: These citations may not always be complete (especially for serials).