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Separately published large format map of the U.S.-Canadian Boundary, from the Rocky Mountains to the Lake of the Woods, published by the US Government.

The boundary between the United States and Canada was set by the Oregon Treaty of 1846 but the surveying of the boundary was interrupted by the Civil War and not completed until 1875. These maps are highly detailed and show many cultural features along the boundary. The lithographic work is excellent. 

Condition Description
Six sheets, plus profile map.