Метр: Засвар хоорондын ялгаа
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Мөр 121:
* [http://www.mel.nist.gov/div821/museum/length.htm Length—Evolution from Measurement Standard to a Fundamental Constant] at U.S. NIST <!-- Information there not yet included in article -->
* [http://histoire.du.metre.free.fr/en/ The History of the Meter] By Tibo Qorl (Translated by Sibille Rouzaud)
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