Desert bighorn sheep establish two desert areas in southwestern Arizona to help preserve the desert bighorn sheep: Cabeza Prieta National Wildlife Refuge and the Kofa National Wildlife Refuge. In 1941, the San Andres National Wildlife Refuge in New Mexico was added. Desert bighorn sheep populations have trended upward since the 1960s when their population was estimated at 6,700-8,100. The upward trend was caused by conservation measures, including habitat preservation. In 1980, desert bighorn sheep populations were estimated at 8,415-9,040. A state-by-state survey was conducted a few years later and estimated the overall US desert bighorn sheep population at 15,980. The 1993 estimate of
Western Desert Campaign Italy declared war from 11 June 1940. The war was fought primarily in the area known as the Western Desert, which was about wide, from Mersa Matruh in Egypt to Gazala on the Libyan coast, along "Litoranea Balbo" ("Via Balbia"), the only paved road. The Sand Sea, inland, marked the southern limit of the desert at its widest points at Giarabub and Siwa. In British parlance, the term "Western Desert" applied to the desert of Egypt west of the Nile but came to describe the whole area of conflict, including eastern Cyrenaica in Libya. From the coast, extending inland lies