Concentration of manganese ores from Boulder Dam Recreational Area, Clark County, Nev. - Batty, J. V.; Agey, W. W. (U.S. Dept. of the Interior, Bureau of Mines, 1948)
"June 1948."
Cover title.
Keywords: Ore-dressing. / http://id.loc.gov/authorities/subjects/sh85095414; Manganese ores / Nevada / Clark County / Metallurgy.