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North American soil geochemical landscapes project: Canadian field protocols for collecting mineral soils and measuring soil gas
radon and natural radioactivity; Friske, P W B; Ford, K L; Kettles, I M; McCurdy, M W
; McNeil, R J; Harvey, B A.
Geological Survey of Canada, Open File 6282, 2010, 177 pages,
https://doi.org/10.4095/261633 
Open Access