Original t.p. reads: Report of the exploring expedition to the Rocky Mountains in the year 1842, and to Oregon and north California in the years 1843-'44. By Brevet Captain J.C. Frémont, of the topographical engineers, under the orders of Col. J.J. Abert, chief of the Topographical Bureau. Printed by order of the Senate of the United States. Washington, Gales and Seaton, printers, 1845.

The Astronomical and Meteorological observations made during the expedition of 1843-'44, Astronomical observations made during the expedition to the Rocky Mountains in the year 1843, and Meteorological observations [1842] which form p. [329]-693 of the original Senate ed. are not included in this reproduction.

A report on an exploration of the country lying between the Missouri River and the Rocky Mountains, on the line of the Kansas and Great Platte Rivers [1842]--Catalogue of plants collected by Lieut. Frémont in his expedition to the Rocky Mountains, by J. Torrey.--A report of the exploring expedition to Oregon and north California, in the years 1843-'44.--Appendices: A. Nature of the geological formations occupying the portion of Oregon and north California included in a geographical survey under the direction of Capt. Frémont, by J. Hall.--B. Descriptions of organic remains collected by Capt. J.C. Frémont, in the geographical survey of Oregon and north California, by J. Hall.--C. Descriptions of some new genera and species of plants, collected in Capt. J.C. Frémont's exploring expedition to Oregon and north California, in the years 1843-'44, by J. Torrey and J.C. Frémont.

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