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1. Evaluation of historical data use in the 1992 August yield survey (id:28865)

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2. Yield models for corn and soybeans based on survey data (id:30680)

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3. The New objective yield models for corn and soybeans (id:30345)

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4. 1983 corn and soybean production input and cropping practices in Illinois, Iowa and Missouri (id:22157)

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5. Technical and economic causes of U.S. corn and soybean yield changes (id:27960)