Central Lahul. Under the leadership of Hamish McArthur, a small expedition consisting of Mrs. McArthur, Mr. and Mrs. Frank Solari, and Captain and Mrs. K. Goswami, entered Spiti on July 23, 1955. From a camp near Shitakar they made a plane table survey of the Lahul peaks and climbed an 18,000-foot peak on the Lahul-Spiti watershed southeast of the Kan2am La. They returned by the Balamo La to the Chandra valley. Up a tributary valley of the Chandra they established an advance base camp. They climbed a 19,000-foot peak north of the glacier in this valley. Their final ascent was Peak 20,430 shown on Map 52 H.