Nacionalni institut za standarde i tehnologiju — разлика између измена
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Ред 48:
* [https://web.archive.org/web/20190402004554/https://nist.time.gov/ The Official U.S. Time]
* [https://web.archive.org/web/20080212191012/http://ts.nist.gov/measurementservices/referencematerials/index.cfm NIST Standard Reference Materials]
* [http://www.nist.gov/cnst/index.cfm NIST Center for Nanoscale Science and Technology (CNST)] {{Wayback|url=http://www.nist.gov/cnst/index.cfm |date=20100309231324 }}
* [http://www.nist.gov/srd/ NIST Scientific and Technical Data]
* [http://dlmf.nist.gov/ NIST Digital Library of Mathematical Functions]
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