A virtually flawless example of George Philip's map of the United States.
The map contains one of the most interesting presentations of the Territories and States which comprise the Transmississippi West. Nebraska Territory extends from Texas to the Canadian Border, although a curious second region named Arkansas probably foreshadows the creation of Kansas.
Within Nebraska are 3 regions named Mandan District, Western District, and Osage Dist., the second of which we have not previously seen on any map. Oregon Territory extends to California, pre-dating the creation of Washington and extend to the Rocky Mountains.
California is New California, and the details of the new Gold Rush are present, with El Dorado or Gold Region named. In Southern California, there is unusually good detail, including Warner's Rancheria, a naming of Warner Ranch which we have never before seen. The eastern half of Utah is Ozark District, another designation we have never seen on a map. Unusual configurations for Minnesota and Iowa appear.
Texas is also oddly configured. There are several forts in Texas which often are not shown on contemporary maps, including Ft. Mattagorda and Ft. Parker. The map is not a derivative of any particular earlier map and seems to provide a relatively fresh presentation of much of the content.
A Note indicates that it has been corrected to the American Maps of Fremont, Emory, Wislizenu and the records of the General Land Office and State of Texas, May 1851.