calentamiento global ¿Nieves eternas en la Sierra Nevada de Mérida?] </ref> Aerial pictures taken in 1952 show the glaciated area had already shrunk to for the Picos Bolívar, Espejo and Concha and to for the Picos Humboldt and Bonpland. In 2003 almost all the glaciers of the area had disappeared, with the exception of a two small glaciated areas ( on Pico Bolívar and on Pico Humboldt). References Pérez O, Hoyer M, Hernández J, Rodríguez C, Márques V, Sué N, Velandia J, Deiros D. (2005). "Alturas del Pico Bolívar y otras cimas andinas venezolanas a partir de observaciones GPS" Interciencia. 30 (4). Jahn, A. "Observaciones glaciológicas de los Andes venezolanos" Cult. Venez.'' 1925, 64:265-80 Notes External links "Pico Bolívar, Venezuela" on Peakbagger Bolivar Glaciers of Venezuela Geography of Mérida (state) Highest points of countries Four-thousanders of the Andes Sierra Nevada National Park (Venezuela) Extreme points of Venezuela