be converted to a bone-marrow population dose of 59,000 person-rad by use of an absorbed dose/exposure factor of 0.7 rad/R (As79). The TMCEFD inexplicably did not include Reno, Nevada, in its tabulation. Apparently, the only exposure in Reno was from event BOLTZMANN of the PLUMBBOB series. According to the PHS report (P157), the estimated exposure at Reno was 45 mR and the population was 35,000 people. This population estimated exposure of 1600 person-R would rank tenth in terms of total community exposure. As noted above, we believe that the TMCEFD overestimated the estimated exposures for the PLUMBBOB series by a factor of two. By making this correction and including the exposure at Reno from event BOLTZMANN, we calculate a corrected population estimated exposure of 19,000/2 person-R + 35,000 persons x 0.045 R = 11,000 person-R for the PLUMBBOB series. For the HARDTACK II series, the calculated population exposures are smal] and all of the community estimated exposures were less than or equal to 150 mR with the exception of Adam's Ranch, Nevada, which received 800 mR. As these values were evidently not corrected for background radiation, the TMCEFD values are perhaps too high by a factor of about 2. Saint George, Utah, received the largest community population estimated exposure of 18,000 person-R and also had a relatively high cumulative estimated exposure of 3.7 R. Other communities in the same area were Hurricane, Washington, La Verkin, and Santa Clara and these also received relatively high exposures as shown in Table 4. The communities of Ely, McGill, East Ely, and Ruth, Nevada, are similarly located close together and represent another area of relatively large 212