Title:
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Moving off the yield plateau : papers presented at a symposium co-sponsored by Divisions S-8 and S-4 of the Soil Science Society of America, Divisions C-1, C-2, and C-3 of the Crop Science Society of America; & Division A-4 of the American Society of Agronomy, held at the tri-society annual meeting, August 25, 1970, in Tucson, Arizona / editors : Jerry D. Eastin, Robert D. Munson.
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