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The National Mineral Reference Collection (NMC) digital spectral (VIS-NIR-SWIR) library. Part IV: spectral database of
REE-Nb-U-Th-bearing minerals for hyperspectral applications; Percival, J B
; Turner, D J; Wickert, L M;
Tomacic, J M. Geological Survey of Canada, Open File 8987, 2023, 10 pages,
https://doi.org/10.4095/332018 
Open Access