1. Critical Mineral Resources of the United States — Economic and Environmental Geology and Prospects for Future Supply Professional Paper 1802–A (US Department of the Interior, US Geological Survey, 2017).
2. Final List of Critical Minerals 2018 Vol. 83, No. 97 (Federal Register, 2018);
gonature.com/2CkTjD4
3. Nassar, N. T., Graedel, T. E. & Harper, E. M. Sci. Adv. 1, e1400180 (2015).
4. McCullough, E. A. & Nassar, N. Miner. Econ. 30, 257–272 (2017).
5. Assessment of Critical Minerals: Screening Methodology and Initial Applications (National Science and Technology Council, 2016).