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SOURCES Alonso, E et al. 2012. Evaluating Rare Earth Element Availability: A Case with Revolutionary Demand from Clean Technologies. Environmental Science & Technology. 46 (3406−3414) PubMed.gov Humphries, M. 2013 Rare Earth Elements: The Global Supply Chain. Congressional Research Service fas.org King, H. Rare Earth Elements and their Uses. geology.com Mineral Commodity Summaries. 2016. United States ... Read more