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Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin
- "Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin"@en
- "Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin"
- "Preliminary report on the Copper-bearing rocks of Douglas county, Wisconsin"
- "Preliminary report on the copper-bearing rocks of Douglas county, Wisconsin"
- "Preliminary report on the copper-bearing rocks of Douglas county, Wisconsin"@en
- "Preliminary report on the Copper-Bearing rocks of Douglas County, Wisconsin"