to Deep Earth Electrical Conductivity.- Electromagnetic induction in the earth due to stationary and moving sources.- The new approach to global deep sounding.- The effect of the oceans and sedimentary cover on global magnetovariational field distribution.- The magnetospheric disturbance ring current as a source for probing the deep earth electrical conductivity.- The conductosphere depth at equatorial latitudes as determined from geomagnetic daily variations.- A deep geophysical study in the Baikal region.- A new telluric KCl probe using Filloux's AgAgCl electrode.