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HELLRIEGEL H, 1889, BER DEUT BOT GES, V7, P138
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HILTNER L, 1903, NATURWISS Z LAND FOR, V1
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MACDOUGAL DT, 1899, ANN BOT, V13, P1
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MULLER PE, 1903, NATURWISS Z LAND FOR, V1
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NOACK, 1889, BOT Z, V47, P389