1. Aldredge , M. D. Analysis of communication systems in coal mines U.S. Bur. Mines Final Rep. 9 54 1973
2. Geological and geophysical consideration in radio propagation through the earth's crust;Ames;IEEE Trans. Antennas Propagat.,1963
3. Anderson , W. L. Fortran IV programs for the determination of the transient electric field and vertical magnetic dipole for an M -layer stratified earth by numerical integration and linear filtering 1 82 Denver, Colo. 1973
4. Anderson , W. L. Electromagnetic fields about a finite electric wire source 1 205 Denver, Colo. 1974