Figure 50.

Dendrogram of cluster analysis for concentrations of elements in sediments. The horizontal axis (link/max) is the percentage of the range from the maximum to minimum distance in the data. Vertical bars by elements denote groups which were determined for links<40 percentage units of link/max. a. All Pacific coast urban sites (n=250). b. West Coast reference and nonurban sites (n=38). c. All Alaskan sites (n=43). See Table 3 for element abbreviations.