Churn drilling at the McGregor zinc-lead mine, Washington County, Mo. / by W.D. McMillan.
|Main Author:||McMillan, W. D.|
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1948.
Zinc mines and mining
> Washington County.
Lead mines and mining > Missouri > Washington County.
Boring > Missouri > Washington County.
Mine examination > Missouri > Washington County.
6 p. :
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