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100   $a20080716d1983      ua             0
101 0 $aeng
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aVertical magnetic noise in the voice frequency band within and above coal mines$b[electronic resource] /$fby John Durkin
210  1$a[Washington, D.C.] :$cU.S. Dept. of the Interior, Bureau of Mines,$d[1983]
215   $a27 pages $cdigital, PDF file
225 1 $aReport of investigations ;$v8828
300   $aTitle from title screen (viewed on July 14, 2008).
606   $aCoal mines and mining$xCommunication systems
615  0$aCoal mines and mining$xCommunication systems.
700   $aDurkin$b John$01391019
712 02$aUnited States.$bBureau of Mines.
801  0$bGPO
801  1$bGPO
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912   $a9910696728403321
996   $aVertical magnetic noise in the voice frequency band within and above coal mines$93543855
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