As a general rule "net book value" is deemed to be the original cost of the property less the depreciation as reflected on the books of the taxpayer and includes the net book value of subsequent capital additions or improvements to the includable property as well as adjustment or partial disposition thereof, by reason of sale, exchange, abandonment, etc.
* If the taxpayer is taxable in the state from which the third party ships the property, then the sale is in such state.
* If the taxpayer is not taxable in the state from which the property is shipped, then the sale is in this state.
35 Miss. Code. R. 3-08-06-402.09