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Geoenvironmental characterization of mine wastes from carbonatite-hosted niobium deposits: ferroniobium slag; Desbarats, A J;
Percival, J B. Geological Society of America, Abstracts With Programs vol. 51, no. 5, 333346, 2019 p. 1,
https://doi.org/10.1130/abs/2019AM-333346 (NRCan Cont.# 20190248)