共 12 条
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[2]
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[3]
CHAPMAN WF, 1963, THESIS U FLORIDA
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FOOTE RJ, 1958, USDA146 AGR HDB
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FOX KA, 1953, USDA1081 TECH B
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GODWIN MR, 1952, 508 FLOR AGR EXP STA
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LADD GW, 1964, 526 IOW AGR EXP STA
[8]
ORCUTT GH, 1970, AM ECON REV, V60, P132
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PURCELL JC, 1969, 72 GEORG AGR EXP STA
[10]
PURCELL JC, 1968, 35 GEORG AGR EXP STA