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journalAt: Plant Systematics and Evolution, 260, 2 By: Friis E. M., Pedersen K. R., Schönenberger J.
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journalAt: Professional Papers / United States Geological Survey, 294, A By: Peck R. E.
bookAt: Geobotany Conf., New York-London, Plenum Press By: Conkin J. E., Conkin B. M.
journalAt: Micropaleontology, 19, 1 By: Bergad R. D.