4, G. W. Rollosson, Air-Shock Pressure-Time vs Distance, Operation Ivy Report WT-602, April 1953. 5. H. S. Ladd et al., Drilling on Eniwetok Atoll, Marshall Islands, Bull. Am. Assoc. Petroleum Geol., 34: 10, 2257-2280 (1953). 6. V. Salmon and S. R. Hornig, Earth Acceleration vs Time and Distance, Operation TumbierSnapper Report WT-517, February 1953. 7. L. D. Leet, Earth Motion from the Atomic Test, Am. Scientist, 34: 198-211 (1946). 29-30