John B. West (May 2003). "George I. Finch and his pioneering use of oxygen for climbing at extreme altitudes". Journal of Applied Physiology. 94 (5): 1702–1713. doi:10.1152/japplphysiol.00950.2002. PMID12679344. Quote: "The first use of supplementary oxygen in the Himalayas was apparently in 1907 when A. L. Mumm, Tom Longstaff, and Charles Bruce went to the Garhwal and made the first ascent of Trisul (7,127 m), which remained the highest summit to be climbed for 21 years." (In fact Pauhunri, although only a few metres higher, was ascended in 1911, only 4 years later).
google.co.uk
Bolinder, Anders (1968). "Height Records". In Barnes, Malcom (ed.). Mountain World 1966/7. George Allen and Unwin Ltd. p. 228. Retrieved 10 February 2025.
John B. West (May 2003). "George I. Finch and his pioneering use of oxygen for climbing at extreme altitudes". Journal of Applied Physiology. 94 (5): 1702–1713. doi:10.1152/japplphysiol.00950.2002. PMID12679344. Quote: "The first use of supplementary oxygen in the Himalayas was apparently in 1907 when A. L. Mumm, Tom Longstaff, and Charles Bruce went to the Garhwal and made the first ascent of Trisul (7,127 m), which remained the highest summit to be climbed for 21 years." (In fact Pauhunri, although only a few metres higher, was ascended in 1911, only 4 years later).
