English, asked by sheikhasalanarif20, 7 months ago

No. of drills employed in shaft sinking

Answers

Answered by ujwalkarthikeyauk

0

Answer:

Explanation:

u. S. DEPARTMENT OF COMMERCE

R. P. LAMONT, Secretary

BUREAU OF MINES

SCOTT TURNER, Director

Bulletin 357

SHAFT-SINKING PRACTICES AND COSTS

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