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 [electronic resource] : Made by direction of the commanding general of the Department of the Columbia, by Lieut. Thomas W. Symons.
Electronic text and image data. Ann Arbor, Mich. : University of Michigan Digital Library, 2004. Includes both TIFF files and keyword searchable text. [Making of America] Mode of access: Internet
Note
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."