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In this paper, model calculations evaluate the usefulness of tomographic image reconstruction from cross-borehole resistivity measurements. The model has two resistive layers with a conductive anomaly imbedded in the lower layer. We calculated the potential distributions along the borehole resulting from a dipole current source located at various places in each borehole. From these data a resistivity map (tomograph) is constructed. For many different cases these tomographs were good representations of both spatial distribution and magnitude of the model resistivity. 6 refs., 4 figs.