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Jaskula, Brian W. (February 2019). "Lithium"(PDF). Mineral Commodity Summaries. U.S. Geological Survey: 98. Archived from the original(PDF) on 18 January 2021. Retrieved 13 November 2019.
Jaskula, Brian W. (February 2019). "Lithium"(PDF). Mineral Commodity Summaries. U.S. Geological Survey: 98. Archived from the original(PDF) on 18 January 2021. Retrieved 13 November 2019.