Two sites in New Mexico and two sites in Arizona are being designated as national historic landmarks.
Interior Secretary Ken Salazar's designation of 27 sites nationwide includes the Murray Springs Clovis Site in Cochise County. The department says the site is associated with the prehistoric Clovis culture.
Arizona's other new historic landmark is the Poston Elementary School in La Paz County. It was the site of a relocation center established during World War II for confinement of Japanese-Americans.
In New Mexico, the Denver and Rio Grande Railroad's San Juan Extension in New Mexico's Rio Arriba County and Colorado's Conejos and Archuleta counties received the designation.
The narrow-gauge line is now owned by the two states and operated as the Cumbres and Toltec Scenic Railroad.
New Mexico's other new landmark is the San José de los Jémez Mission and Gíusewa Pueblo Site. The Interior Department says the site is associated with the spread of Spanish control into the present-day American Southwest and is an early representation of the intersection of European and native cultures.
The department says landmark designations mean each site gets a designation letter, a plaque, and technical preservation advice.
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