APPENDIX A MAPS OF DAILY FALLOUT Maps showing the daily fallout on the monitoring network from February 28 to May 31, 195), and the average daily fallout during the month of June, 195, are appended. All values of radioactivity are in d/m collected on a square foot of gummed film in a day, extrapolated to 100 days after the burst. In most cases, two films were exposed simultaneously and the values for each are shown. The burst to which the debris was assigned for extrapolation purposes is indicated on each map. (See sec. 2.6 with reference to burst assignments after May 21.) Lines delineating the areas of significant fallout (over 100 df/m/ft“/day extrapolated to 100 days after burst), labelled with the event believed responsible for the fallout, are shown. The lines are dashed in areas of greatest wecertainty. The precipitation which fell during each sampling period is shown in accordance with the code given on the maps. reduced to its water equivalent. - 39 - Snow has been