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100   $a20080716d1984      ua             0
101 0 $aeng
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aApparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests$b[electronic resource] /$fby John Durkin
210  1$a[Washington, D.C.?] :$cU.S. Dept. of the Interior, Bureau of Mines,$d[1984]
215   $a18 pages $cdigital, PDF file
225 1 $aReport of investigations ;$v8869
300   $aTitle from title screen (viewed on July 15, 2008).
606   $aEarth resistance (Geophysics)$xMeasurement
606   $aElectromagnetic waves$xTransmission$xMeasurement
615  0$aEarth resistance (Geophysics)$xMeasurement.
615  0$aElectromagnetic waves$xTransmission$xMeasurement.
700   $aDurkin$b John$01391019
712 02$aUnited States.$bBureau of Mines.
801  0$bGPO
801  1$bGPO
906   $aBOOK
912   $a9910696728803321
996   $aApparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests$93444284
997   $aUNINA