4%. K.8. Larson; “Radin-Ecological Aspects of Nuciear Fallout”; Operation Plumbbob, Program $7; Department of Agriculture, Washington, D.C.; Unclassified. 49. J. Lockhart, R.A. Baus and J.H. Blifford; “Atmospheric Radioactivity along the 80th Meridian, 1946”; NRL Report 4965, July 23, 1957; Naval Research Laboratory, Washington, D.¢,; Unclassified. 50. A.K. Stebbins I; “ Progress Report on the High Altitude Sampling Program”; DASA529, 1 July 1959; Defense Atomic Support Agency, Washington 25, D.C.; Unclassified. 51. A.K. Stebbins OI; “HASP Special Report”; DASA-532b, 1 June 1960; Defense Atomic Support Agency, Washington 25, D.C.; Unclassified. §2. Summary Report, High Altitude Sampling Program (Technical Report Nr 1) March 1957- February 1958; Defense Atomic Support Agency, Washington 25, D.C.; Secret. 53. Summary Report, High Altitude Sampling Program (Technical Report Nr 2) March 1958March 1959; Defense Atomic Support Agency, Washington 25, D.C.; Secret. 54. Summary Report, High Altitude Sampling Program (Technical Report Nr 3) (tn press); Defense Atomic Support Agency, Washington 25, D.C.; 55. H.W. Feely; “Strontium-90 Content of the Stratosphere,” “A Low Concentration of Strontium-90 In the Stratosphere Indicates a Short Stratospheric Residence Time, ” Science 131, 845 (1960). 56. J. Spar; “Strontium -90 in the Stratosphere,” presented at the Strontium-90 Symposium, Bad Kreuznach, Germany, 28 October 1959. 57. W.P. Libby; “Radioactive Strontium in Fallout”: Proc. Nat. Acad. Sci. 42, No.6, pp. 365-390, June 1956; Unclassified. 58. R.D. Maxwell et al; “Evaluation of Radioactive Fallout”; AFSWP 978, 15 September 19§5; Armed Forces Special Weapons Project, Washington 25, D.C., Secret Restricted Data. 59. L.F. Hubert, L. Machta and R.J. List; “A Meteorological Analysis of the Transport of Debris from Iperation Ivy”; U.S. Weather Bureau, NYO-4555, October 1953; Health and Safety Laboratory, New York Operations Office, USAEC, New York, New York; Secret Restricted Data. 60. L. Machta and R.J. Liat; “ Analysis of Stratospheric Sr Measurements”; March 1959; U.S. Weather Bureau, Washington, D.C.; Unclassified. 61. N.E. Ballou and L.R. Bunney; “Nature and Distribution of Residual Contamination, 0”; Project 2.6c-2, Operation Jangle, WT-~397, June 1952; U.S. Naval Radiological Defense Laboratory, San Francisco, California; Secret Restricted Data. 62. Private communication, P.C. Stevenson; Chemistry Division, University of California 63. Private communication, R.W. Spence and G. A. Cowan; Group J-11, Los Alamos Scien- Radiation Laboratory, Livermore, California. tific Laboratory, Los Alamos, New Mexico. 64, Private communication, K. Street; Chemistry Division, University of California Radiation Laboratory, Livermore, California. 65. Philip Krey; “AFSWP Fallout Symposium”; AFSWP-895, January 1955; Armed Forces Special Weapons Project, Washington 25 D.C.; Secret Restricted Data. 66. L.R. Bunney and N.E. Ballou; “Bomb Fraction Measurement Techniques”; USNRDL- TR-176, 11 September 1957; U.S. Naval Radiological Defense Laboratory, San Francisco, Callfornia; Secret Restricted Data. 88