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181   $ctxt$2rdacontent
182   $cc$2rdamedia
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200 00$aUltrasonic method and apparatus for determining crack opening load$b[electronic resource] $epatent application
205   $a[Redacted ed.]
210  1$a[Washington, DC] :$c[National Aeronautics and Space Administration],$d[1988]
215   $a1 online resource $cillustrations
225 1 $aNASA case ;$vLAR-13889-1
300   $aTitle from PDF title screen (NASA, viewed June 18, 2010).
410  0$aNASA case ;$vLAR-13889-1.
517   $aUltrasonic method and apparatus for determining crack opening load 
606   $aUltrasonics
615  0$aUltrasonics.
712 02$aUnited States.$bNational Aeronautics and Space Administration.
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801  1$bGPO
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912   $a9910697278203321
996   $aUltrasonic method and apparatus for determining crack opening load$93451539
997   $aUNINA