Report of an examination of the upper Columbia river and the territory in its vicinity in September and October, 1881, to determine its navigability, and adaptability to steamboat transportation. - United States. Army. Corps of Engineers; Symons, T. W. (Thomas William), 1849-1920. (Washington, Govt. Print. Off., 1882)
Appended is "Map of the upper Columbia river ... 25 sheets and an index sheet. From surveys and examinations made in 1881, by Lieut. Thomas W. Symons ... and Alfred Downing ... Drawn by Alfred Downing."
Keywords: Columbia River Valley; United States -- Discovery and exploration