ia | SECTION I1 MONTHLY SUMMARIES FOR INDIVIDUAL STATIONS Because of the change in emphasis for different test series and because of differences between Nevada Tests and Pacific and Foreign Tests, the network has been subject to considerable change over the years. The majority of the data presented are for sampling stations which have had a continuous history since the end of 1952 when the first world-wide network was established, Some stations entering the network later, particularly those set up in cooperation with the U. N. Scientific Committee on the Effects of Atomic Radiation, are also included, Stations having data for only limited periods are not listed. These would include: 1, Special stations operating for short periods of time around the two United States test sites. . 2. Certain stations operating in cooperation with the U. S. Public Health Service, 3, Other stations not forwarding samples on a continuous basis, A map of the network is given in Figure 2, The stations operating directly with HASL (Table 13) are distinguished from those operating through the United Nations Scientific Committee (Table 14). Table 15 is made up of the summary tables for all stations in order of station number. In all of the summary tables, composite samples are marked with a single asterisk (*). Where geographical interpolation was required to fill out a table, the values are marked with a double asterisk (**), -~ 37 - §