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able to inventory amount areal backcountry campsites barren core blackened logs Bob Marshall Wilderness campsite monitoring system Canyon National Parks class definitions Code-A-Site form Cole condition class condition of wilderness David N defined three classes Department of Agriculture disaggregated Eagle Cap Wilderness ecological evaluate change EXTENT OF DEVELOPMENT fire ring Forest and Range Forest Service Frissell ical impacted sites individual parameters inventory all sites Kings Canyon National large number line transects litter meaningful parameters measure of impact mineral soil Missoula Montana number of campsites number of tree Olympic National Park pacted sites parameters separately Parsons and MacLeod percent cover photographs points of existing precise techniques Range Experiment Station recreational impacts root exposure Schreiner and Moorhead Selway-Bitterroot Wilderness Sequoia and Kings Smoky Mountains summary rating tion tree damage TREE ROOTS types U.S. Department variables vegetation cover VEGETATION Loss visual estimates Wilderness campsite impacts wilderness managers Yosemite National Park