- Cole, D. N.1987. Research on soil and vegetation in wilderness: A state-of-knowledgereview. Pages 135-177 in R. C. Lucas(comp.), Proceedings, national wilderness research conference: Issues,state-of-knowledge, future directions. General Technical Report INT-220. USDAForest Service, Ogden, Utah.
- Deluca, T. H., W. A. Patterson Iv, W. A. Freimund, andD. N. Cole. "Influence of Llamas, Horses, and Hikers on Soil Erosion fromEstablished Recreation Trails in Western Montana, USA." Environmental Management 22.2 (1998): 255-62.
- Monz, Christopher A. "The Response of Two ArcticTundra Plant Communities to Human Trampling Disturbance." Journal of Environmental Management 64.2 (2002): 207-17.
- Li, Wenjun, Xiaodong Ge, and Chunyan Liu. "HikingTrails and Tourism Impact Assessment In Protected Area: Jiuzhaigou BiosphereReserve, China." EnvironmentalMonitoring and Assessment 108.1-3(2005): 279-93.
- Kuss, F. R.1983. Hiking boot impacts on woodland trails. Journal of Soil and Water Conservation 38: 119-121.
- Törn, A., A. Tolvanen, Y. Norokorpi, R. Tervo, and P.Siikamäki. "Comparing the Impacts of Hiking, Skiing and Horse Riding onTrail and Vegetation in Different Types of Forest."Journal ofEnvironmental Management 90.3(2009): 1427-434.
- Daly, Matthew. "Bush Signs Bill for Wild SkyWilderness." Local News.Seattle Times, 9 May 2008. Web. 03 Mar. 2014.
- Lal, R. 1994. Soil erosion research methods, 2nd ed. Soil Water Conservation Society, Ankeny, Iowa.
- Washington Trails Association: Endangered Trails Guide2002-2008
- Washington Trails Association: Volunteer
- Washington Trails Association Snoqualmie Survey
- Pacific Northwest Trail Association
- High Cascades Forest Volunteers
- Ashland and Woodlands Trails Association
- USDA
- Middle Fork
Figures/Photos
- Boundary Trail Photo: http://www.wta.org/go-hiking/trip-reports/trip_report.2013-07-11.8191964739
- Circle Peak Photo: http://www.wta.org/go-hiking/trip-reports/tripreport-2007090210
- Middle Fork Cascade River Trail Photo: http://www.wta.org/go-hiking/trip-reports/tripreport-2006050903
- Mt. Rainier photo: http://parks.mapquest.com/national-parks/mount-rainier-national-park/
- Soil Erosion photo: http://www.lebanonhills.com/sustainable-trails/
- Trail to Necklace Valley Photo: http://www.wta.org/go-hiking/trip-reports/trip_report.2013-06-13.5010859597
- Table 1: Deluca, T. H., W. A. Patterson Iv, W. A. Freimund, and D. N. Cole. "Influence of Llamas, Horses, and Hikers on Soil Erosion from Established Recreation Trails in Western Montana, USA." Environmental Management 22.2 (1998): 255-62.
- Figure 1: http://www.wta.org/signpost/snoqualmie-survey-hiking-most-popular-activity
- "WTA 2013 By The Numbers": http://www.wta.org/about/2013_accomplishments
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