Book excerpt: The only English-language guidebook to South America's highest mountain, featuring 27 routes from the three major approaches and thoroughly researched advice on lodging, permits, equipment, seasons, weather and more. Reaching the highest summit in the Western hemisphere requires careful preparation and detailed instruction. R. J. Secor draws upon his extensive mountaineering experience to give climbers all that's necessary to top Aconcagua's 22,841-foot peak. This updated and revised guide features comprehensive information on recommended equipment, safety and health precautions, and conservation issues. It details both the popular and less- travelled routes reached via the Horcones Valley, South Face, and Vacas and Relinchos Valleys. Also included are a climbing history of Aconcagua and a glossary of valuable Spanish mountaineering phrases.