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serviceberry to 88.8 for chokecherry. Average ages of shrubs measured <br />for each species ranged from 12.0 years for chokecherry to 28.6 years <br />for Gambel oak. <br />Using the regression irodels provided in Tables 6-12 and the results of <br />aspen basal area and shrub height estimates, average ages of shrub <br />stands and aspen within the different vegetation types are shown in <br />Table 13. While certain limitations are necessarily imposed on the use <br />of these average age determinations by the low R2 values fcr size-age <br />nodels of some species, they still provide a good picture of age <br />characteristics. <br /> <br />• <br />-38- <br />