47 "Thomas Keefer on Mining in Thunder Bay", in Arthur (ed.), Thunder Bay District, pp. 159-162; A.W. Roland to H. de la Ronde, 5 September 1875, Matheson Papers, Folder 1899.
47 "Thomas Keefer on Mining in Thunder Bay", dans Arthur (ed.), Thunder Bay District, p. 159-162; A.W. Roland à H. de la Ronde, 5 septembre 1875, Matheson Papers, Chemise 1899.