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1كتاببواسطة Griffin, Steven"…Iowa State University. Center for Agricultural and Rural Development…"
منشور في 1978
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2كتاببواسطة Heady, Earl Orel, 1916-"…Iowa State University. Center for Agricultural and Rural Development…"
منشور في 1972
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3كتابمنشور في 1961"…Iowa State University. Center for Agricultural and Rural Development…"
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4كتابمنشور في 1973"…Iowa State University. Center for Agricultural and Rural Development…"
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5وقائع المؤتمر كتابمنشور في 1963"…Iowa State University. Center for Agricultural and Rural Development…"