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CANNY JJ, 1984, ADV PLANT PHYSL, P277
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DAVIS EA, 1969, USDA RM140 ROCK MT F
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DAVIS EA, 1970, BOT GAZ, V131, P53
[7]
DAVIS EA, 1964, USDA RM35 ROCK MT FO
[8]
DAVIS JR, 1976, USDA RM24 ROCK MT FO
[9]
FREED VH, 1969, TECH B OREGON STATE, V100
[10]
HIBBERT AR, 1974, USDA RM126 ROCK MT F