[United States National Bureau of Standards Ruler]

Year:	1972
Document Type:	N/A
Issuing Agency:	United States. National Bureau of Standards.
Series:	NBS special publication
Report Number:	NBS Special Publication 376
Subjects:	Weights and measures.
	Standards of length.
	Metric system -- United States.
Link:	http://digital.library.unt.edu/ark:/67531/metadc123540/