@article {5016,
	title = {A Comparison of Surface Impact By Hiking and Horseback Riding on  Four Trail Surfaces in Great Smoky Mountains National Park},
	year = {1978},
	month = {April},
	institution = {U.S. Department of the Interior, National Park Service },
	address = {Gatlinburg, TN},
	keywords = {Biking, Conservation -- Trails, Hiking, Trails},
	isbn = {24},
	url = {http://ia600807.us.archive.org/15/items/comparisonofsurf00whit/comparisonofsurf00whit.pdf},
	author = {Whittaker, Paul L and Susan Power Bratton}
}
@article {5006,
	title = {Black Bear Management In Great Smoky Mountains National Park},
	year = {1977},
	institution = {U.S. Department of the Interior, National Park Service},
	address = {Gatlinburg, TN},
	keywords = {Black bears, Black bears -- Management},
	url = {http://diglib.lib.utk.edu/dotsdata/Whittaker_BlackBearManagement_1977.pdf},
	author = {Whittaker, Paul L}
}
@article {5696,
	title = {Great Smoky Mountains National Park: Disturbance and Visitation on Mount Le Conte},
	year = {1977},
	institution = {U.S. Department of the Interior, National Park Service},
	address = {Gatlinburg, TN},
	keywords = {Mount Le Conte, Tourism -- Environmental impacts},
	url = {http://diglib.lib.utk.edu/dotsdata/Bratton_GSMNPDisturbanceAndVisitationOnMountLeConte_1977.pdf},
	author = {Susan Power Bratton and Whittaker, Paul L}
}
