Progress Report on Revision of the WTO-UNEP Guidelines on the development of terrestrial and marine national parks for travel and tourism. World Tourism Organisation, Madrid, 1991.
bibtex   
@book{noauthor_progress_1991,
	address = {Madrid},
	title = {Progress {Report} on {Revision} of the {WTO}-{UNEP} {Guidelines} on the development of terrestrial and marine national parks for travel and tourism},
	language = {en},
	publisher = {World Tourism Organisation},
	year = {1991},
}

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