Cordón de la Jaula. Under the leadership of Jorge Peterek, a group of the Centro Andino Buenos Aires made a number of first ascents in this range, which lies southeast of Aconcagua and about 40 miles south of Upsallata. The others were Pablo and Andrés Dudzinski, Estanislao Bli- charski, and Andrés Patewski. From a 10,000-foot base camp up a side valley off the Río Blanco they set up a high camp at 13,500 feet. From there, on January 8, 1956, they climbed up steep ice to a col between Giewont, 16,400 feet, and Tatra, 17,050 feet, and thence to both summits. From camp in another valley a little farther north, on January 13, they climbed 17,150-foot Karpinski and continued along the ridge to CABA, 17,325 feet, and Aguila Blanca, 17,725 feet.