Photograph: Copyright © 1997 Roy D. Tea

This map was created under the supervision of Professor Derle Thorpe of the Utah State University engineering faculty who recorded the distances and bearings during what was termed the Mirage Expedition in 1962. Other members of the party were  Professors David Miller and Web of the University of Utah. These three followed the trail from the Knolls flight strip, just west of the Grayback Hills to Donner Spring. Note the Big Bend.