National Geographic : 1956 Mar
© National Geographic Society 351 4 Peruvian Survey Squad Starts Up a 17,200-foot Snow Peak in the Andes While surveying from peak to peak, United States and Peruvian engineers and soldiers camp at sites up to 18,000 feet without benefit of oxygen. Tents, gasoline stoves, and layers of clothing protect them against wind and cold. Here Peruvian Army Lt. Fritz Du Bois, who studied geodesy with the United States Coast and Geodetic Survey, leads the way up Nevado Ticaco, northeast of Tacna. + Indian women in always-fashionable felt derbies offer potatoes and tuberous ocas for sale in Puno, on Lake Titicaca (page 353). "Irish" potatoes originated in the Andes.