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- [9] FROM CORN BELT OF UNITED-STATES - PRODUCTION AND PROTECTION OF HYBRID SEEDS AGRICULTURA DE LAS AMERICAS, 1977, 26 (08): : 30 - &
- [10] TECHNICAL CHANGE IN CORN PRODUCTION IN THE UNITED-STATES, 1870-1960 JOURNAL OF FARM ECONOMICS, 1964, 46 (04): : 751 - 765