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Guidelines : development of national parks and protected areas for tourism / World Tourism Organization, United Nations Environment Programme Monografia Publication Madrid : WTO, cop. 1992 Description II, 53 p. : il. ; 30 cm LocationBiblioteca da UMinho no Campus de Azurém Availability Available (1).

Awards for improving the coastal environment : the example of the blue flag / United Nations Environment Programme Industry and Environment, World Tourism Organization, Foundation for Environmental Education in Europe Monografia Publication Paris : UNEP, cop. 1996 Description 50 p. : il. ; 30 cm LocationBiblioteca da UMinho no Campus de Azurém Availability Available (1).