Recreation Ecology: the Ecological Impact of Outdoor Recreation and Ecotourism. Liddle, M. Chapman and Hall, London, 1997.
bibtex   
@book{liddle_recreation_1997,
	address = {London},
	title = {Recreation {Ecology}: the {Ecological} {Impact} of {Outdoor} {Recreation} and {Ecotourism}},
	language = {en},
	publisher = {Chapman and Hall},
	author = {Liddle, M.J.},
	year = {1997},
}

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