Where the stetion record started too late to detect the first arrival of material or ended too early te collect debris when debris was in the neighborhood, the station total is enclosed in brackets. Data thought to be questionable on other grounds is also bracketed and all such numbers are essentially ignored in the final-analysis. United States and Canadian data are represented by two values plotted in Figure 6.2 in the western and the eastern United States. These numbers represent the average total for the two groups of stations. Table 6.2 shows Jac ih esi a || the results of this analysis. - ho = oe