Knoerr, A., and Eigo, M., 1963, Arizona's newest copper producer--The Christmas mine: Engineering and Mining Journal, v. 164, no. 1, p. 55-67.
Knoerr, A., and Eigo, M.
Engineering and Mining Journal, v. 164, no. 1, p. 55-67.
Mineral District, Areal, Structure, Stratigraphy, History, Production, Skarn, Mining Engineering, Ore, Copper,
