(Unknown author) Interest Maintained Through Competition and Prizes, Fostered by Safety Committees November 1926—For the last two years, all the mining branches of the Phelps Dodge Corporation situated in Arizona, New Mexico, and the northern part of the state of Sonora, Mexico, have been engaged in an intensive campaign of establishing the principles and practices … Sigue leyendo Safety-First Celebration of the Moctezuma Copper Co. (1926)