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Composite gamma ray spectrometric maps of airborne reconnaissance surveys flown in southern Quebec, 1976, 1983 and 1986 / Cartes
spectrométrique par rayons gamma integrée à partir des levés de reconnaissance aérienne effectués dans le sud du Québec, 1976, 1983
et 1986; Hetu, R. Geological Survey of Canada, Open File 2299, 1990, 8 pages,
https://doi.org/10.4095/128193 (Open Access)