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The National Mineral Reference Collection (NMC) digital spectral (VIS-NIR-SWIR) library, part II: REE-Nb-U-Th-bearing
minerals; Percival, J B
; Abraham, A C; Laudadio, A B;
Sinclair, C D. Geological Survey of Canada, Open File 8619, 2019, 16 pages,
https://doi.org/10.4095/315690 
Open Access