[United States National Bureau of Standards Ruler] Item: 1 of 2

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United States. National Bureau of Standards. [United States National Bureau of Standards Ruler], physical object, December 1972; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc123540/m1/1/ocr/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.