1. Origin of radioactive fallout in the northern hemisphere after the spring maximum in 1959;Bleichrodt;J. Geophys. Res.,1961
2. On the spring maximum of radioactive fallout from nuclear test explosions;Bleichrodt;J. Geophys. Res.,1961
3. Federal Radiation Council, 1963, Estimates and Evaluation of Fallout in the United States from Nuclear Weapons Testing Conducted through 1962, Washington, D.C., Report No. 4, pp. 33.
4. Friend, J. P. , Feely, H. W. , Krey, P. W. , Spar, J. , and Walton, A. , 1961, The High Altitude Sampling Program, Westwood, New Jersey, Defence Atomic Support Agency Publ. No. DASA 1300, 8, pp. 307.