The first pure mountaineers (as opposed to surveyors) to have climbed in the Himalaya were the English barrister William Graham, the Swiss hotelier Emil Boss and the Swiss mountain guide Ulrich Kaufmann, who together climbed extensively in the area in 1883. The previous year Graham had made the first ascent of the Dent du Géant, and Boss and Kaufmann had equally notably very nearly made the first ascent of Aoraki / Mount Cook in New Zealand. Among others, they claimed a near ascent of Dunagiri (reaching about 6,900 m), an ascent of Changabang (6,864 m, 22,520 ft) in July in the Garhwal Himalaya, and an ascent to 30 feet below the east summit of Kabru south of Kangchenjunga in October, but most of the ascents are disputed. It is not claimed that they lied about their ascents, rather that the poor quality of maps at the time may have led them to be unsure of which mountain they were actually on, and to make estimates of their height which owed more to wishful thinking than scientific measurements. Their description of Changabang is so at variance with the mountain itself that their claim was doubted almost immediately, and by 1955 was not taken seriously anymore.