1. Federal Register/Vol. 86, No. 214/Tuesday, November 9, 2021/Notices, https://www.regulations.gov/documents/DOI-2021-0013-002
2. Marshall, J., Why Rare Earth Recycling is Rare-And What We Can Do About It, April 7, 2012., Ensia.com/features/rare-earth-recycling/
3. China to Form Two Rare Earth Giants to Strengthen Pricing Power, Bloomberg News September 24, 2021, updated www.bloomberg.com/news/articles/2021-9-247
4. China “Watch” Canada: Rare-Earth Mining in China Comes at a Heavy Cost for Local Villages, www.thegardian.com/environment/2012/aug/07/china-rare-earth-village-pollution, www.china-briefing.com/news/china-tighens-control-over-management-of-rare-earth
5. Rare Element Security-Air Force Magazine, November 1, 2020, www.airforcemag.com/article/rare-elements-of-security