HOOGHIEMSTRA , HENRY. “POLLEN MORPHOLOGY OF THE PLANTAGO SPECIES OF THE COLOMBIAN ANDES AND ITS APPLICATION TO FOSSIL MATERIAL ”. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales 15, no. 58 (December 31, 1983): 41–65. Accessed July 27, 2026. https://raccefyn.co/index.php/raccefyn/article/view/3782.