Memoir of the Proposed Territory of Arizona

"The NEW TERRITORY of ARIZONA, better known as the GADSDEN PURCHASE, lies between the thirty-first and thirty-third parallels of latitude, and is bounded on the north by the Gila River, which separates it from the territory of New Mexico; on the east by the Rio Bravo del Norte, (Rio Grande), which separates it from Texas; on the south by Chihuahua and Sonora, Mexican provinces; and on the west by the Colorado River of the West, which separates it from Upper and Lower California...