REFERENCES Beck, H. L., Condon, W. J., and Lowder, W. M. Spectrometric Techniques for Measuring Environmental Gamma Radiation USAEC Report HASL-150, Bennett, Legendre, B. G. October and Beck, Tschebyscheff, H. (1964) L. and Half-Range Legendre Polynomial Solutions of the Gamma Ray Transport Equation in Infinite Homogeneous and Two Media Plane Geometry USAEC Report HASL-185, August (1967) Lanning, W. D. Application of the Spherical Harmonics Technique to Problems in Gamma Transport Nucl. Sci. and Eng., 15, 259-267 (1963) Hubbell, J. H. and Berger, M. J. Photon Attenuation and Energy Transfer Coefficients, Tabulations and Discussions NBS Report 8681, May (1965) Gerasimov, I. P. and Glazovskaya, M. A. Fundamentals of Soil Science and Soil Geography, Gosudarstvennoe lzdatel'stvo Geograficheskoi Liter- atury, Moskva 1960 Translated from Russian by Israel Program for Scientific Translations, Jerusalem (1965) Beck, H. L., Lowder, W. M., Bennett, B. G., and Condon, W. J. Further Studies of External Environmental Radiation USAEC Report HASL-170, March (1966) * Vedheo ee wt