Sheet no. 2. Profiles of passes in the Sierra Nevada; from Explorations and Surveys made under the direction of the Hon. Jefferson Davis, Secretary of War by Lieut. R.S. Williamson, Topl. Engr. assisted by Lieut. J.G. Parke, Topl. Engr. and Mr. Isaac Williams Smith, Civ. Engr. 1853. Explorations and Surveys for a Rail Road Route from the Mississippi River to the Pacific Ocean. War Department. Routes in California to connect with the routes near the 32nd and 35th parallels. (1861)