(. S BGRPRESRE DA C) 0018933 ACKNOW LEDGMENTS The authors wish to acknowledge the vital contributions made to the Project, in both the field and the laboratory, by members of the Los Alamos Scientific Laboratory, the University of California’ Radiation Laboratory, and the U.S. Naval Radiological Defense Laboratory. Persons contributing invaluable aid included: G. Cowan, P, Guthals, and H. Plank from the Los Alamos Scientific Laboratory; R. E, Fleming, R. Goeckerman, Stevenson, and K. F. Momyer, E. Freiling, Nervik, P. Street from the University of California Lawrence Radiation Laboratory; and J. Abriam, N. Ballou, han, W. Batzel, M.G. Lai, D. Love, J. . nil C, Carna- Mackin, M. Nuckolls, J. O'Connor, D. Sam, E. Scadden, E. Schuert, P. Strom, E. R. Tompkins, T. Triffet, H. Weiss, L. Werner and P. Radiological Defense Laboratory. Zigmeéen from the U.S. Naval