"This volume consists of those parts of the [twelfth vol.] of the Pacific railroad reports, which describe the natural condition and products of the country traversed by the surveying expedition near the 47th and 49th parallels of latitude ... None of the plates in this volume have been before published."--Pref Preface, including a brief narrative of the explorations from 1853 to 1857.--Errata, with additions and corrections up to 1860.--pt. I. Meteorology.--pt. II. Botanical reports: 1. Report upon the botany of the route, by J. G. Cooper. 2. Catalogue of plants collected east of the Rocky mountains, by Asa Gray. 3. Catalogue of plants collected in Washington territory, by J. G. Cooper.--pt. III. Zoological report: 1. Insects, by John T. [!] Leconte. 2. Mammals, by J. G. Cooper, G. Suckley and G. Gibbs. 3. Birds: Land birds, by J. G. Cooper; Water birds, by G. Suckley. 4. Reptiles, by J. G. Cooper. 5. Fishes, by G. Suckley. 6. Mollusca, by William Cooper. 7. Crustacea, by J. G. Cooper extracted picklist Errata leaf concerning t.p., tipped opposite t.p Provenance: George Suckley's signed presentation inscription to Norton Folsom Tucker Collection