magnetic field  search
UFfield, magnetic
RTcosmic rays
 alternating field demagnetization
 electrical field
 Earth
 annual variations
 Earth-current methods
 currents
 coastal effects
 coercivity
 core
 dynamos
 dipole moment
 diurnal variations
 electromagnetic field
 electromagnetic induction
 electromagnetic
SNBefore 1974, also search magnetic fields. Before 1972, was sometimes used in combination with planetary bodies, therefore also search magnetic field, Moon or magnetic field, Mars as applicable.
magnetic field of the Earth  search
SNNot a valid GeoRef index term after 1970. Used in subfile N.