Whenever used in chapter 42, Laws of 1970 ex. sess., the term "value of the taxable property" shall mean the actual value of the taxable property in a taxing district incurring indebtedness, as the term "taxing district" is defined in RCW
39.36.010, to be ascertained by the last assessment for state and county purposes previous to the incurring of such indebtedness except that in incorporated cities the assessment shall be taken from the last assessment for city purposes, plus the timber assessed value for the district as defined in RCW
84.33.035.