Visitor Impact Management: A Review of Research. Kuss, F. & Graefe, A. Technical Report National Parks and Conservation Association, Washington, 1990.
bibtex   
@techreport{kuss_visitor_1990,
	address = {Washington},
	title = {Visitor {Impact} {Management}: {A} {Review} of {Research}},
	language = {en},
	institution = {National Parks and Conservation Association},
	author = {Kuss, F.R. and Graefe, A.R.},
	year = {1990},
}

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