By services, 18 January, 2022 31 July 1990 Internal T.I. 9003127 F - Disposition of Income Debentures
By services, 18 January, 2022 30 October 1992 External T.I. 9222345 F - Assumption Of Contingent Liability Re Purchase Of Assets
By services, 3 December, 2018 15 June 1993 Administrative Letter 9231896 F - Deductibility of Ontario Mining Tax in Computing Income
