1. P.L. Rozelle, N. Mamula, B.J. Arnold, T. O’Brien, M. Rezaee, S.V. Pisupati, Secondary cobalt and manganese resources in Pennsylvania: quantities, linkage with mine reclamation, and preliminary flowsheet evaluation for the U.S. domestic lithium-ion battery supply chain Pa. State Univ. Cent. Crit. Miner. 2021.〈https://www.c2m.psu.edu/sites/default/files/publications/2021/Cobalt%20Study%20Report%20Dec%202021.pdf〉.
2. Rozelle, P.L., Shi, F., Rezaee, M., Pisupati, S.V. (2020). The Pennsylvania State University Center for Critical Minerals. 〈https://www.c2m.psu.edu/sites/default/files/publications/2020/2020-Pennsylvania_Cobalt_Report.pdf〉.
3. U.S. Geological Survey. (2022a). Manganese. Mineral commodity summaries. 〈https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-manganese.pdf〉.
4. U.S. Geological Survey. (2022b). Cobalt. Mineral commodity summaries. 〈https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-cobalt.pdf〉.
5. Slack, J.F., Kimball, B.E., and Shedd, K.B. (2017). Cobalt, chap. F of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. F1– F40, https://doi.org/10.3133/pp1802F.