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DEPARTMENT OF THE INTERIOR

FRANKLIN K. LANE, SECRETARY

BUREAU OF MINES

VAN. H. MANNING, DIRECTOR

MANGANESE

USES, PREPARATION, MINING COSTS
AND THE PRODUCTION OF

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DEPARTMENT OF THE INTERIOR

FRANKLIN K. LANE, SECRETARY

BUREAU OF MINES

VAN. H. MANNING, DIRECTOR

MANGANESE

USES, PREPARATION, MINING COSTS AND THE PRODUCTION OF

[merged small][merged small][merged small][graphic][subsumed][subsumed][subsumed][subsumed][subsumed][merged small][merged small]
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