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1圖書由 Griffin, Steven“...Iowa State University. Center for Agricultural and Rural Development...”
出版 1978
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2圖書由 Heady, Earl Orel, 1916-“...Iowa State University. Center for Agricultural and Rural Development...”
出版 1972
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3圖書出版 1961“...Iowa State University. Center for Agricultural and Rural Development...”
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4圖書出版 1973“...Iowa State University. Center for Agricultural and Rural Development...”
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5Conference Proceeding 圖書出版 1963“...Iowa State University. Center for Agricultural and Rural Development...”