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Preprint from the ... Bureau of Mines Minerals yearbook. The mineral industry of Iowa
- "Mineral industry of Iowa"@en
- "Statistics"@en
- "Periodicals"@en
- "Preprint from the ... Bureau of Mines Minerals yearbook. The mineral industry of Iowa"@en
- "Preprint from the ... Bureau of Mines Minerals yearbook. Mineral industry of Iowa"@en