Every producer of forest products who shall ship the same out of the State of Alabama in an unmanufactured condition or who shall sell such product for shipment outside the State of Alabama in an unmanufactured condition shall, within 30 days after the expiration of each quarter annual period expiring, respectively, on the last day of March, June, September and December of each year, file with the Department of Revenue a statement under oath, on forms prescribed by the Department of Revenue, showing the kinds of forest products and the gross quantity thereof severed from the soil in Alabama and shipped or sold for shipment to points outside the State of Alabama in an unmanufactured condition, the county or counties in which such products were severed from the soil and such other reasonable and necessary information pertaining thereto as the Department of Revenue may require for the proper enforcement of the provisions of this article. At the time of rendering such quarter annual reports, such producer of forest products shall pay to the Department of Revenue the taxes herein imposed by this article upon the forest products embraced in said report.