This data set was compiled by V. E. Derr and is available in hard copy and on magnetic tape. The parameters were collected over many years in response to requests by researchers for atmospheric electromagnetic wave propagation. Data presented include attenuation coefficients for the atmosphere and H2O; 1962 Standard Atmospheres; cloud drop size distributions for water and ice spheres; solar spectral irradiance; sky spectral radiance; Rayleigh coefficients for air; refractive indices for air, ice, liquid H2O, and various atmospheric aerosols; and relative reflectance for ice and H2O.