The geography of Tourism and Recreation / C. Michael Hall
SNC-AP - Sistema de Normalização Contabilística para as Administrações Públicas / Pedro Correia Ribeiro
New Challenges with Geotourism : Proceedings of the VIII European Geoparks Conference. Idanha-a-Nova, 14-16 September 2009 (Portugal) / Carlos Neto de Cravalho
Arouca Geopark : Nomination file for a European Geopark / AGA - Arouca Geopark Association