Notice to Exporters Softwood lumber exports to the United States: Possible company exclusions process regarding a potential United States investigation into imports of certain Canadian softwood lumber products into the United States. Serial No. 200 - Notice to Exporters Softwood lumber exports to the United States: Possible company exclusions process regarding a potential United States investigation into imports of certain Canadian softwood lumber products into the United States. Serial No. 200 - 2016-10-19