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• daliri.qazaleh Investigating the Environmental Effects of Ecotourism and the Role of Environmental Education in Reducing its Destructive Effects(Case study: South Khorasan province) [ Vol.18, Issue 3 - Autumn Year 1399]
• Dorbeiki.Mazdak A Survey and Analysis of Production and Management of Medical Waste in Golestan Province, Iran [ Vol.18, Issue 4 - Winter Year 1399]