"Columbia River group, Washington, Oregon, and Idaho"@en . "Maps"@en . . . . "Basalt of the Columbia River group, Washington, Oregon, and Idaho"@en . "Tectonic structure of the main part of the basalt of the Columbia River group, Washington, Oregon, and Idaho"@en . . . . . . . . . . . . . . . "U.S." . . "Columbia Plateau" . .