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Churn drilling at the McGregor zinc-lead mine, Washington County, Mo.

Published Year

• 1940-1949 (1)

Subject

• Boring--Missouri--Washington County (1)
• Lead mines and mining--Missouri--Washington County (1)
• Mine examination--Missouri--Washington County (1) *
• Zinc mines and mining--Missouri--Washington County (1)

Author

• McMillan, W. D. (1) *

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