1.
図書 |
Manitoba. University. Faculty of Agriculture and Home Economics ; Iowa State University. Center for Agricultural and Economic Development
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2.
図書 |
Iowa State University. Center for Agricultural and Economic Development
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3.
図書 |
Iowa State University Center for Agricultural and Economic Development
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4.
図書 |
assembled and published under the sponsorship of the Iowa State University Center for Agricultural and Economic Development
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5.
図書 |
Iowa State University. Center for Agricultural and Economic Development
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6.
図書 |
assembled and published under the sponsorship of the Iowa State University Center for Agricultural and Economic Adjustment
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7.
図書 |
Assembled and published under the sponsorship of the National Committee on Agricultural Policy, the Farm Foundation, and the Center for Agricultural and Economic Adjustment at Iowa State University. Mervin G. Smith, director; Carlton F. Christian, editor
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