01379nam 2200349Ka 450 991069672880332120080716081731.0(CKB)5470000002381586(OCoLC)234072162(EXLCZ)99547000000238158620080716d1984 ua 0engtxtrdacontentcrdamediacrrdacarrierApparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests[electronic resource] /by John Durkin[Washington, D.C.?] :U.S. Dept. of the Interior, Bureau of Mines,[1984]18 pages digital, PDF fileReport of investigations ;8869Title from title screen (viewed on July 15, 2008).Earth resistance (Geophysics)MeasurementElectromagnetic wavesTransmissionMeasurementEarth resistance (Geophysics)Measurement.Electromagnetic wavesTransmissionMeasurement.Durkin John1391019United States.Bureau of Mines.GPOGPOBOOK9910696728803321Apparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests3444284UNINA