Proton resonance methods base on the analysis of magnetic fields, only. This may explain, why NMR data interpretations in geophysical field tests differ from those of time domain electromagnetic measurements for subsoils with high electrical conductivity. In this paper, a joint interpretation of transient electromagnetic and proton resonance surface data is discussed on the basis of the linearized MaxwellBloch system derived by the authors in earlier paper. Uniqueness of the simultaneous determination of spatially dependent electric conductivity and the initial magnetization is shown for a layered medium.