Grand Coulee dam Letter concerning John Mix Stanley as an unwitting arbiter in controversy over location of Grand Coulee. Oregon Historical. Quarterly , v.50 #2 June,1958 P 157 America's last frontier; history and description. Overland Trails v.1 ^1 December, 1935 p.i5 Giant in size and output of power. Post Jl 17, 1966 p.10 Three generators sabotaged. Post N 10, 1978 p.14