Bulletin, Issue 959U.S. Government Printing Office, 1948 - Geology |
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Acad aeromagnetic survey alternating current America Bull amplifier analysis anomalies apparatus application assignor circuit Claims allowed coil component comprising computed condensed by V. S. core corporation of Delaware curves deposits depth detector determination direct current discussed drilling earth earthquakes electrical logging electrical resistivity electrode elements equation formation frequency geochemical geoid Geol Geological Survey geomagnetic Geophys Geophysical Abstracts given gradient gravimeter gravity ground horizontal hypocenters indicated Inst instrument intensity investigations issued kilometers layer magnetic field magnetometer maps means measurements ments meters method milligal minerals Moscow Niemegk observations Observatory obtained Okla oscillation output Petroleum potential problem prospecting radio radioactive Rayleigh waves records reflection region Rept resistivity rocks Røros rotating Russian samples seismic waves seismograph seismological seismometer signal soil stations structure surface temperature terrestrial theory tion torsion balance Tulsa U. S. patent values variation velocity vertical vibrations voltage Washington