@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}
}
