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Depth-integrated snowpack chemistry was measured just prior to maximum snowpack depth during the winters of 1992?1999 at 12 sites co-located with National Atmospheric Deposition Program/National Trend Network (NADP/NTN) sites in the central and southern Rocky Mountains, USA. Winter volume-weighted mean wet-deposition concentrations were calculated for the NADP/NTN sites, and the data were compared to snowpack concentrations using the paired t-test and the Wilcoxon signed-rank test. No statistically significant differences were indicated in concentrations of SO42? or NO3? (p>0.1). Small, but statistically significant differences (p0.03) were indicated for all other solutes analyzed. Differences were largest for Ca2+...