Manganese deposits of Colorado - Muilenburg, G. A. (Garrett A.), 1889-; Wheeler, Harold Leslie (Denver, Colo., Eames brothers, state printers, 1919)
"Bibliography on the occurrence, geology, and mining of manganese, with some references on its metallurgy and uses, comp. by Harold L. Wheeler": p. 54-69.
Keywords: Manganese ores -- Colorado