electromagnetic methods  search
BTgeophysical methods
 .electromagnetic methods
UFelectromagnetic prospecting
RTimpedance
 geophysical surveys
 Green function
 electrical methods
 crosshole methods
 broad-band spectra
 dipole-dipole methods
 laser methods
 frequency domain analysis
 electromagnetic induction
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SNFor surveys, search with geophysical surveys and an area. For surveys, also index geophysical surveys and the area.