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200 1 $aTime and frequency: theory and fundamentals$fByron E. Blair (Ed.)
210   $aWashington$cU. S. Department of Commerce, National Bureauof Standards$d1974
215   $aIX, 459 p.$cill. c. geogr. tab. in parte ripieg.$d26 cm
225 2 $aNBS Monograph$v140
410  0$12001$aNBS Monograph
606 0 $aMisura del tempo
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702  1$aBLAIR,$bByron E.
801  0$aIT$bsalbc$gISBD
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