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Portable XRF spectrometry, fusion, multi acid, and aqua regia results from the Warden borehole,
southern Ontario; Knight, R D
; Coffin, L M; Valiquette, L J;
Russell, H A J
. Geological Survey of Canada,
Open File 7922, 2016, 21 pages,
https://doi.org/10.4095/297841 
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Access