File:Economic geology of the United States (IA economicgeology00ries).pdf
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![File:Economic geology of the United States (IA economicgeology00ries).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Economic_geology_of_the_United_States_%28IA_economicgeology00ries%29.pdf/page1-381px-Economic_geology_of_the_United_States_%28IA_economicgeology00ries%29.pdf.jpg?20200814091018)
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