found: Work cat.: William Henry Jackson Papers. Digital Library Collection, 2001.
found: GNIS Jul. 30, 2001(Washburn, Mount, summit 10243 el., Wyoming, Park County, Elephants Back Mountain, 44⁰47ʹ52ʺN, 110⁰26ʹ01ʺW)
found: Getty Jul. 30, 2001(Washburn, Mount (mountain) 44⁰47ʹN, 110⁰26ʹW; Wyoming, Park County)
found: Yellowstone Place Names, 1988:p. 76(Named highest Peak Washburn Peak ... Mount Washburn (10,243 ft.) (photograph))
found: GeoNames [algorithmically matched]summit; 44°47ʹ52ʺN 110°26ʹ04ʺW