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Third World: agricultural and food problems --- Agronomy --- Arid regions --- Land degradation --- Nomads --- Range management --- Rangelands --- Sustainable development --- Environmental Sciences and Forestry. Soil Science --- Management --- Control --- Monitoring --- Land degradation and Land conservation --- Land degradation and Land conservation. --- Developing countries: agricultural and food problems --- Range management - Congresses --- Range management - Middle East - Congresses --- Rangelands - Congresses --- Rangelands - Remote sensing - Congresses --- Nomads - Congresses --- Nomads - Middle East - Congresses --- Arid regions - Management - Congresses --- Land degradation - Control - Congresses --- Sustainable development - Congresses --- Rangelands - Monitoring - Congresses