Klondike Diary
Robert B. Medill, Klondike Diary, (Portland: Beattie and Company), 1949, p. 122
Then there was George W. Carmack, who, with his two Indian brothers-in-law, made the first discovery. George staked Discovery claim, which was double in size, and his brothers-in-law staked No. 1 above and No.1 below, giving the three two thousand feet up and down the creek.
Source: Robert B. Medill, Klondike Diary (Portland: Beattie and Co., 1949)