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Surficial Geology, Sherbrooke-Orford-Memphremagog, Quebec / Géologie des dépôts meubles, Sherbrooke-Orford-Memphremagog,
; Mcdonald, B C. Geological Survey of Canada, Preliminary Map 5-1966, 1967, 1 sheet, https://doi.org/10.4095/107735