(11) Shleien, B., Cochran, J.A. and Magno, P. Sr-90, Sr-89, Pu-239 and Pu-238 Concentration in Ground |O Level Air from 1964 - 1969 Radiological Health Data and Reports U. S. Dept. of Health Educaticn & Welfare, March 1970 (in press) (12) Patterson, ni Lead in C.C. and Salvia, J.D. the Modern Environment Scientist & Citizen, April, 1968, p. 66 (13) Prospero, J.M. and Carison, T.N. Radon-222 in the North Atlantic Trade Winds: Its Relationship to Dust Transport from Africa Science, 167, p. 974, 1970 (14) (15) (16) Kay, K.. A Look at the Future of Hazardous Contamination of the Circumpclar Environment Arch. Envirenmental Health, 17, 1968, p. 653 EURATOM Joint Nuclear Research Centre ~- Ispra Establishment USAEC Report HASL~-193, April (1968), p. IIiI-34 Ibid USAEC Report HASL=-197, July (1969), p. III-57 (17) Ibid USAEC Report HASL=200, October (18) Ibid USAEC Report HASL-204, January (19693) p. III-31l (19) Ibid USAEC Report HASL-207, April (1969), p. III-35 (20) Ibid USAEC Report HASL-210, July (1969), p. III~-74 (21) Ibid USAEC Report HASL-214, October (1969), p. III-6 (22) Ibid USAEC Report HASL-217, (1970), p. III-16 (23) January (1968), p. Plutonium Isotopes at Selected Sites USAEC Report HASL~217 III-13 (Appendix), January (1975), p. C-l I - 24