Electromagnetic Methods: Theory and Applications, Volume 66 highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors. Sections in this new release include Introduction to the special issue, Electromagnetic induction in the Earth's mantle and oceans: Forward and inverse modeling, Marine controlled source and magnetotelluric methods, Probing the Lunar Interior with Electromagnetic Geophysical Methods, and Sensor development and applications in mineral exploration.