First edition, Senate issue. Charles Fremont's report was included in a number of Gold Rush compendia as it provided a reliable description of the terrain. The map, drawn by Charles Preuss, is titled: 'Map of Oregon and Upper California from the Surveys of John Charles Fremont....' Wheat describes this as "the one great general map of 1848,... though the map is not without defects, it is a wonderfully graphic report on where the expedition of 1845-46 went and what it saw. Great credit must be given to Edward M. Kern [for the topographical work].... As a contribution to cartographical knowledge, the case for the map's importance was well put by Fremont himself... In extent, it embraces the whole western side of this continent between the eastern base of the Rocky Mountains and the Pacific Ocean, and between the Straits of Fuca and the Gulf of California... It is, without question, the most influential map of the region during the 19th Century and a centerpiece to any western map collection", as well as probably the first to locate the gold regions in California.