File:1987 Census of Mineral Industries. Preliminary report. Summary Series (IA 1987censusofmin871uns).pdf
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![File:1987 Census of Mineral Industries. Preliminary report. Summary Series (IA 1987censusofmin871uns).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/1987_Census_of_Mineral_Industries._Preliminary_report._Summary_Series_%28IA_1987censusofmin871uns%29.pdf/page1-426px-1987_Census_of_Mineral_Industries._Preliminary_report._Summary_Series_%28IA_1987censusofmin871uns%29.pdf.jpg?20200620025923)
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