AEA Expeditions - Expedition & trekking service for Aconcagua, Tupungato, Pissis, Mercedario and peaks throughout the Andes. (location unknown) - http://www.aeaexpeditions.com
ACONCAGUA TREK - From 1979 in Aconcagua. Trekkings, expeditions, mules, transfers, camping in LOS PUQUIOS, base camp services - http://www.rudyparra.com
Aconcagua Spirit - Expeditions and trekking on Aconcagua, Volcan Lanin, Mercedario, and Penitentes as well as expedition logistical support. (Mendoza, Argentina) - http://www.aconcaguaspirit.com.ar
Climb Ecuador - Offers full-service climbing trips to the Andes Mountains of Ecuador, Bolivia and Peru, also itinerary, photos and trip reports. (New York, New York) - http://www.climbecuador.com
Cabeça Verde School of Rock Climbing - Rock climbing instruction and guided climbs. Includes a history of the school and information about local climbing areas. (Rio de Janeiro, Brazil) - http://www.climbinrio.com/
Adventure Planet - Offers climbing and mountaineering trips in Bolivia or Patagonia in Argentina and Chile. Content in English and Spanish. - http://www.planetaventura.com
Andesport - Aconcagua expedition services including guide service and transport. Content in English, Spanish, and French. - http://www.andesport.com/
Inka Expeditions - Offers guided expeiditons to Aconcagua. Includes trip information, guide biographies, and customer comments. Content in English and Spanish. (Mendoza, Argentina) - http://www.aconcagua.org.ar/
Aconcagua 2002 - Aconcagua expeditions. Gear list, itinerary, and past expedition reports. (Mendoza, Argentina) - http://www.aconcagua2002.com.ar