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The National Mineral Reference Collection (NMC) digital spectral (VIS-NIR-SWIR) library, part III: background REE-Nb-U-Th-bearing
mineral databases; Percival, J B
; Abraham, C; Fardy, I; Turner,
D J. Geological Survey of Canada, Open File 8932, 2022, 20 pages,
https://doi.org/10.4095/331102 
Open Access