@article {3521,
	title = {Assessing Trail Conditions in Protected Areas: Application of a Problem-Assessment Method in Great Smoky Mountains National Park, USA},
	journal = {Environmental Conservation},
	volume = {26},
	year = {1999},
	month = {December},
	pages = {270-279},
	keywords = {Conservation, Tourism, Trail erosion, Trail maintenance},
	url = {http://parks.ca.gov/pages/1324/files/f19902\%20leung\&marion.pdf},
	author = {Leung, Yu-Fai and Marion, Jeffrey L}
}
@article {3522,
	title = {Characterizing Backcountry Camping Impacts in Great Smoky Mountains National Park, USA},
	journal = {Journal of Environmental Management},
	volume = {57},
	year = {1999},
	month = {November},
	pages = {193-203},
	keywords = {Camping, Conservation},
	author = {Leung, Yu-Fai and Marion, Jeffrey L}
}
@article {3520,
	title = {The Influence of Sampling Interval on the Accuracy of Trail Impact Assessment},
	journal = {Landscape and Urban Planning},
	volume = {43},
	year = {1999},
	month = {January},
	pages = {167-179},
	keywords = {Trail erosion, Trail maintenance},
	author = {Leung, Yu-Fai and Marion, Jeffrey L}
}
@book {11788,
	title = {An Assessment of Campsite Conditions in Great Smoky Mountains National Park},
	series = {Research/Resources Management Report},
	year = {1997},
	note = {Illustrations},
	pages = {127},
	publisher = {U. S. Department of the Interior, National Park Service },
	organization = {U. S. Department of the Interior, National Park Service },
	keywords = {Camping, Recreation},
	author = {Marion, Jeffrey L and Leung, Yu-Fai}
}
@article {6862,
	title = {Developing a Natural Resource Inventory and Monitoring Program for Visitor Impacts on Recreation Sites: A Procedural Manual},
	year = {1991},
	month = {October},
	institution = {National Park Service},
	address = {Denver, CO},
	keywords = {Conservation -- Government regulations, Recreation, Tourism -- Environmental impacts, Wildlife management},
	issn = {NPS/NRVT/NRR-91/06},
	url = {http://www.wilderness.net/toolboxes/documents/recsitemonitor/MarionJ_InventorySite.pdf},
	author = {Marion, Jeffrey L}
}
