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• The protected area network of parks : monitoring the balance between nature conservation and sustainable tourismCottrell, Stuart; Raadik Cottrell, JanaSustainable tourism & the millennium development goals : effecting positive change2013 / p. 307-325 : ill https://www.academia.edu/6741890/The_Protected_Area_Network_of_Parks_Monitoring_the_Balance_Between_Nature_Conservation_and_Sustainable_Tourism