"For the stone from the top for geologists, the knowledge of the limits of endurance for the doctors, but above all for the spirit of adventure to keep alive the soul of man."
— George Mallory
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American North Face Direct Expedition - 1991

In 1991, AFFIMER co-sponsored The American North Face Direct Expedition, an environmentally sensitive expedition co-sponsored with the Ohmeda Corporation to study the effects of acclimatization on oxygen saturation levels. 

During the 1991 expedition, field research also was conducted on the glacial history of the north side of Mount Everest. This work resulted in publication of :  Mann, D.H., Sletten, R.S., and Reanier, R.E. (1996). Quaternary glaciations of the Rongbuk Valley, Tibet.  Journal of Quaternary Science 11, 267-280.