共 11 条
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TECHNICAL CHANGE IN CORN PRODUCTION IN THE UNITED-STATES, 1870-1960
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[2]
BRUNTHAVER CG, 1971, FEB NAT OUTL C USDA
[3]
CLOUGH M, 1968, FEED SITUATION
[4]
HOUCK JP, 1969, AGR ECON RES, V21, P99
[6]
MILLER TA, 1970, ERS453 COL STAT U AG
[7]
1967, 345 AGR HDB
[8]
1961, 239 AGR INF B
[9]
1947, FEED SITUATION
[10]
1967, ERS410 STAT B