Preliminary sketch of the Northern Pacific Rail Road exploration and survey, by I. I. Stevens, Governor of Washington Territory.Stevens, Isaac Ingalls, 1818-1862[1855]Each sheet includes profile of ground covered."Proof corrected in Office of P.R.R. Surveys, Feb 10th 1855. All copies printed prior to this date contain errors. G. K. Warren. Lieut. Topl. Engrs."Description derived from published bibliography.Sheet [1] From St Paul to Riviere des Lacs.--Sheet [2] From Riviere des Lacs to the Rocky Mountains.--Sheet [3] From the Rocky Mountains to Puget Sound.cartographic