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U.S. Department of Commerce; National Bureau of Standards
view article (1.0)Department of Commerce, Washington, DC; National Bureau of Standards, Washington, DCNBS Handbook 81NBS Handbook 81Safety Rules for the Installation and Maintenance of Electric Supply and Communication Lines. Comprising Part 2: The Definitions and the Grounding Rules of the Sixth Edition of the National Electrical Safety Code. National Bureau of Standards Handbook 81, Government Printing Office, Washington, DC, 84 p., 1961