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any drilling or exploration expense, including any general geological or geophysical expense, incurred by the taxpayer after 1971 on or in respect of exploring or drilling for petroleum or natural gas in Canada,
any drilling or exploration expense, including any general geological or geophysical expense, incurred by the taxpayer after 1971 on or in respect of exploring or drilling for petroleum or natural gas in Canada,
any drilling or exploration expense, including any general geological or geophysical expense, incurred by the taxpayer after 1971 on or in respect of exploring or drilling for petroleum or natural gas in Canada,