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HOOGHIEMSTRA , H. POLLEN MORPHOLOGY OF THE PLANTAGO SPECIES OF THE COLOMBIAN ANDES AND ITS APPLICATION TO FOSSIL MATERIAL . Rev. Acad. Colomb. Cienc. Ex. Fis. Nat. 1983, 15 (58), 41-65. https://doi.org/10.18257/raccefyn.15(58).1983.3782.