A superb study by topographical engineer and scientist Emory of the lands newly wrested from the Mexican government. As Wagner-Camp notes, "his report was a major contribution to the geographical knowledge of North America... The report includes sections on the plants and animals, as well as on the geology and the prehistoric town sites and other archeological remains. Emory's descriptions of the various Indian tribes that he encountered were steps toward the newly-forming discipline -Anthropology- concerned with primitive man." This issue is apprently that which combines signatures from the House and Senate issues, "probably made from left-over sheets," the main body of the report being the 416 pp. of the Senate issue, with the addition of the reports of Abert, Cooke and Johnston from the House issue. The 24 plates in the Abert report are, as Howes puts it, "excuted, in a superior manner, anonymously." The large folding map is not listed in Wagner-Camp as being issued with this hybrid, but is present in this copy. Wheat calls it "a document of towering significance in the cartographic history of the West," and "epoch-making." It has a few stains, but is still in quite nice condition. Cowan p.195; Graff 1249; Howes E145; Wagner-Camp 148:4; Wheat Transmississippi 505 & 544; Zamorano Eighty 33.