Full text
an expenditure incurred at any time relating to the injection of any substance to assist in the recovery of petroleum, natural gas or related hydrocarbons from a natural reservoir, or
an expenditure incurred at any time relating to the injection of any substance to assist in the recovery of petroleum, natural gas or related hydrocarbons from a natural reservoir, or
an expenditure incurred at any time relating to the injection of any substance to assist in the recovery of petroleum, natural gas or related hydrocarbons from a natural reservoir, or