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خواهش میکنم کمکم کنید.
Variability in Draft Data Observed During Tillage

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Paper number 031121, 2003 ASAE Annual Meeting . @2003
Authors: Pedro Andrade Sanchez, Shrini K. Upadhyaya, Kenshi Sakai