38. Lapp, Ralph3 Kulp, J. L.3; Ecxelmann, #. R.; and Schulert, A. R. 933% (1957). STRONTIUM-90 IN MAN. pcience 125, Biological hazards from fallout sr?? following ‘nuclear explosions are discussed. 39 Lewis, zc. 3. | ~ LEUKEMIA AND IONIZING RADIATION. Science 125, 965- . 972 (1957). 40. o a ae Libby, Willard F. DEGREE OF HAZARD TO HU:ANITY FRO! RADIOACTIVE FALL= OUT FROM. NUCLEAR WEAPONS TESTS. Libby to Dr. Schweitzer). (A letter from Dr. Scientists 12, 206-7 (1957). 41. Libby, Willard F. RADIOACTIVE FALLOUT. | Remarks prepared by Dr. Willard F. Libby, Com.issioner, U. S. Atomic Energy Commission for delivery before the spring meeting of the American Physical Society, Washington, D. C., April 26, 1957. 42. bADDyspatard F. 43. Machta, THE ATON CAN DO TO YOU AND FOR YOU. World 64-70 and 73-77 (May 17; 1957). L.3 and List, R. J. STRONTIUM-90 MAIN HAZARD. 21% (1957). New Scien s 71, Machta, L.3; and List, R. J. WORLD-WIDE TRAVEL OF ATOMIC DEBRIS. 4727 ’ Science 12s, (1956). The dispersal of radioactive airborne purticles from two nucleur tests in the Pacific Proving Grounds of the ALC was truced by counting the activity on sheets of gummed film exposed at stiutions located throughout the world. A series of mups illustrate tre fallout dispersal pattern at various tines following the test Shots. The effects of prevailing ceteorologicul con- Gitions on fallout dispersal ard deposition are aiscusseda.