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Portable XRF spectrometry, fusion, multi acid, and aqua regia results from the Aurora borehole, Yonge Street Aquifer, southern
Ontario; Knight, R D
; Sharpe, D R
; Valiquette, L J. Geological
Survey of Canada, Open File 7919, 2015, 21 pages,
https://doi.org/10.4095/297418 
Open Access