Environmental impacts of tourism on U.S. National Parks. Wang, C. & P.S.Miko Journal of Travel Research, 35(4):31–36, 1997.
bibtex   
@article{wang_environmental_1997,
	title = {Environmental impacts of tourism on {U}.{S}. {National} {Parks}.},
	volume = {35},
	language = {en},
	number = {4},
	journal = {Journal of Travel Research},
	author = {Wang, C.and P.S.Miko},
	year = {1997},
	pages = {31--36},
}

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