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[Anonymous], FLOWER BEE PLANT LIF
[2]
BAILEY WW, 1889, BOT GAZ, V14, P158
[3]
BAILEY WW, 1884, B TORREY BOT CLUB, V11, P55
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BLANCHAN N, 1900, NATURES GARDEN AID K
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DARWIN C, 1874, NATURE, V9, P460
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FRISON TH, 1923, THESIS U ILLINOIS
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FRISON THEODORE H., 1928, ENT AMER, V8, P159
[8]
HALSTED BD, 1889, BOT GAZ, V14, P129
[9]
HILDEBRAND F, 1866, JB WISS BOT, V5, P359
[10]
HILDERBRAND F, 1870, JB WISS BOT, V7, P423