34 FIGURE CAPTIONS AND TABLE TITLES FIG. 1. Relative external gamma-ray exposure rate vs. time calculated for shot Harry. FIG. 2. Comparison of the relative external gamma-ray exposure rates calculated for shot Harry with those reported by Glasstone and Dolan (G177, pp. 392, 393, 450). FIG. 3. Comparison of the relative external gamma-ray exposure rates calculated for shot Smoky with field measurements of Smoky fallout. FIG. 4, Comparison of the relative external gamma-ray exposure rates calculated for shot Smoky with Dunning's prescription (Du58). FIG. 5. Zero time atom ratios of volatile fission product mass chains to 7p in offsite fallout from Nevada tower shots Diablo, Shasta and Smoky. FIG. 6. The solid circles represent unfractionated debris. Volatile/refractory ratio (volatile to refractory phase relative amounts) in the fallout from tower shots Diablo, Shasta and Smoky as a function of distance from ground zero.