Nautical charts. Columbia River, Oreg. and Wash., Vancouver to Bonneville, topography by Coast and Geodetic Survey in 1935-39, supplemented by surveys by U. S. Engineers in 1935 and 1939, and by Geological Survey in 1893-1916, hydrography by U. S. Engineers in 1935 and 1939; no. 6156. Scale 1:40,000.