Coffman, Joseph S.
Manganese availability--market economy countries : 1980's perspective / by Joseph Coffman. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1992. - ii, 25 p. : ill., map. - Information circular ; 9327 . - Information circular (United States. Bureau of Mines) ; 9327. .
Manganese industry.
Manganese mines and mining.
Manganese availability--market economy countries : 1980's perspective / by Joseph Coffman. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1992. - ii, 25 p. : ill., map. - Information circular ; 9327 . - Information circular (United States. Bureau of Mines) ; 9327. .
Manganese industry.
Manganese mines and mining.