In Russian. Kovtun, Aida Andreevna. The use of a natural electromagnetic field in the study of Earth's electrical conductivity. Ispol'zovanie estestvennogo elektromagnitnogo polya pri izuchenii elektroprovodnosti Zemli. In Russian /The use of a natural electromagnetic field in studying the Earth's electrical conductivity . All images are for identification of editions only. Several books of the same edition may be available. Please feel free to request photos of available books. SKU1035346