Climber Bradford Washburn gathered data, repeated the climbs, and took new photos to evaluate Cook's 1906 claim. Between 1956 and 1995, Washburn and Brian Okonek identified the locations of most of the photographs Cook took during his 1906 Denali foray and took new photos at the same spots. In 1997 Bryce identified the locations of the remaining photographs, including Cook's summit photograph; none was taken anywhere near the summit. Washburn showed that none of Cook's 1906 photos was taken past the Gateway (north end of the Great Gorge), 12 horizontal bee-line miles from Denali and below its top.