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Teshome, B. ,  Kassa, H. ,  Padoch, C. ,  Mohammed, Z. ,  [Determinants Level of Income of Gums and Resins in the Dry Forest Areas and the Contribution to Different Socio Economic in Northwestern and Southern Ethiopia] ,  Determinants Level of Income of Gums and Resins in the Dry Forest Areas and the Contribution to Different Socio Economic in Northwestern and Southern Ethiopia