Loke, M.H., 1998, RES2DINV version 3.3: Rapid 2D Resistivity and IP inversion using the least-squares method. Computer disk and manual, Penang, Malaysia.Loke, M.H., 1998, RES2DINV, Rapid 2D resistivity and IP inversion using the least-squares method, User manual: Austin Tex., Advanced...