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Shiferaw, Abebe; Hergarten, Christian; Kassawmar, Tibebu; Zeleke, Gete (2014). Meta-Analysis of Long-Term Land Management Effect on Soil Organic Carbon (SOC) in Ethiopia. International Journal of Agricultural Research, 10(1), pp. 1-13. Academic Journals, New York 10.3923/ijar.2015.1.13