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ALLARD R. W., 1961, CROP SCI, V1, P127, DOI 10.2135/cropsci1961.0011183X000100020012x
[3]
ALLARD R. W., 1964, CROP SCI, V4, P503
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PFAHLER P. L., 1965, CROP SCI, V5, P47, DOI 10.2135/cropsci1965.0011183X000500010015x