Notice to the reader -- 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 Lieutenant Frémont in his expedition to the Rocky Mountains / by John Torrey -- A report of the exploring expedition to Oregon and north California, in the years 1843-'44 -- Appendix A: Nature of the geological formations occupying the portion of Oregon and north California included in a geographical survey under the direction of Captain Frémont / by James Hall -- Appendix B: Descriptions of organic remains collected by Captain J.C. Frémont, in the geographical survey of Oregon and north California / by James Hall --- [Appendix] C: Note concerning the plants collected in the second expedition of Captain Fremont / John Torrey -- Description of some new genera and species of plants, collected in Captain J.C. Frémont's exploring expeditions to Oregon and north California, in the years 1843-'44 / by John Torrey and J.C. Frémont -- Astronomical observations made during the expedition of 1843-'44 -- Meteorological observations made during the expedition of 1843-'44 -- Astronomical observations made during the expedition to the Rocky Mountains in the year 1843 -- Meteorological observations [1842]

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