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100   $a20160121d1979      ua             0
101 0 $aeng
181   $2rdacontent
182   $2rdamedia
183   $2rdacarrier
200 10$aRecent improvements to the ASTM-type ultrasonic reference block system /$fDaniel J. Chwirut
210  1$aGaithersburg, MD :$cU.S. Dept. of Commerce, National Institute of Standards and Technology,$d1979.
215   $a1 online resource
225 1 $aNBSIR ;$v79-1742
300   $a1979.
300   $aContributed record: Metadata reviewed, not verified. Some fields updated by batch processes.
300   $aTitle from PDF title page.
320   $aIncludes bibliographical references.
700   $aChwirut$b Daniel J$01390278
701   $aChwirut$b Daniel J$01390278
712 02$aUnited States.$bNational Bureau of Standards.
801  0$bNBS
801  1$bNBS
801  2$bGPO
906   $aBOOK
912   $a9910710287303321
996   $aRecent improvements to the ASTM-type ultrasonic reference block system$93503726
997   $aUNINA