Median concentrations of tungsten (), cobalt (), copper (), cadmium (), and lead () in Nevada tree rings through time

<p><b>Copyright information:</b></p><p>Taken from "Temporal Variability of Tungsten and Cobalt in Fallon, Nevada"</p><p></p><p>Environmental Health Perspectives 2007;115(5):715-719.</p><p>Published online 20 Feb 2007</p><p>PMCID:PMC1867993.</p><p>This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original DOI</p> In all cases, the solid line indicates Fallon ( = 5 trees) and the dashed line indicates comparison towns ( = 6 trees). Data are plotted using the approximate mid-point of each time period as the -axis value. -Values of significance from the one-tailed Mann-Whitney tests of medians () are given for each time period for each element