Effects of burning and grazing on a Colombian páramo ecosystem / Robert Gerardus Maria HofstedeSpatial and temporal modelling of vegetation patterns : burning and grazing in the paramo of Los Nevados National Park, Colombia / Pita Adriana VerweijFlora, vegetation and ecology in the Venezuelan Andes : a case study of Ramal de Guaramacal / Nidia Lourdes Cuello AlvaradoHolocene upper forest line dynamics in the Ecuadorian Andes : a multiproxy study / Marcela Cecilia Moscol OliveraHolocene upper forest line dynamics in the Ecuadorian Andes : a multiproxy study / Marcela Cecilia Moscol OliveraFlora, vegetation and ecology in the Venezuelan Andes : a case study of Ramal de Guaramacal / Nidia Lourdes Cuello AlvaradoThe vegetation of the Páramos of the Colombian Cordillera Oriental / by Antoine Marie Cleef