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List of contributors

ALI Mushir - Mekelle University, Department of Geography and Environmental Studies, Mekelle, ETHIOPIA. E-mail: mushirjbd@gmail.com

EKWAL Imam - Mekelle University, Department of Biology, Mekelle, ETHIOPIA. E-mail: ekwalimam@rediffmail.com; ekwalimam01@gmail.com

TAHIR Hussain - Mekelle University, Department of Geography & Environmental Studies, Mekelle, ETHIOPIA. E-mail: tessytahir@gmail.com