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analysis anemometer Arizona Ashurst Lake average basal area campground centers chi-square distribution Coefficient Collins Colorado Colorado State University community type computed conifer consumer surplus data set density Department of Agriculture distribution Douglas-fir eddy correlation Engelmann spruce equation error Figure Forest and Range Fraxinus function grand fir grasslands height inches Independent Variable infected juniper Juniperus Juniperus scopulorum measurements method mixed conifer Moran's National Forest North Dakota observers origin zones parameters pennsylvanica percent Pinus plant plots ponderosa pine populations prediction procedures profile models random Range Experiment Station recreation Region regression relationships relative cover response Rocky Mountain Forest Rocky Mountain juniper Rocky Mountain Station sample scopulorum seed sources seedlings sensors simulation singular path soil southwestern species spps stand standards and guidelines statistics stimuli Symphoricarpos occidentalis tion transect travel cost trees U.S. Department variance estimator virginiana habitat type volume white fir wildlife woodlands Z-scores