## Numerical Values of the Path Integrals for Low and Very Low Frequencies, Volume 13 |

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approximation assumed Berry and Chrisman Berry and Mary Bremmer BUREAU OF STANDARDS calculation caustic CO CO conductivity constant curves derivative diffraction discontinuity discussed distance earth exponential field strength figure formulas function geometric optics given Government graph ground wave Harper II II II incidence increases indicates interest ionospheric reflection coefficients Johler L. C. Walters Laboratory Leslie LF and VLF Located low frequencies magnetic field Materials measured methods necessary NUMERICAL VALUES occurs Office path integrals phase lag Physics plane of incidence propagation pseudo-Brewster angle ratio Refer reflection height saddle point scientific shadow region shown in figure shows Sources space Standards surface Tech Technical Notes Technology theory varies Wait wave hop X X X