The latest round of U.S. tariffs on Canadian softwood lumber, which will take effect on October 14, is set to exacerbate financial pressures on secondary forestry producers in northern British Columbia, potentially forcing layoffs and permanent mill closures. The additional 10 per cent duty comes on top of existing 35 per cent anti-dumping and countervailing duties, pushing total import taxes on Canadian softwood lumber entering the United States above 45 per cent.    John Brink, founder of Brink Forest Products, which has operated mills in Prince George, Vanderhoof, and Houston since 1975, described the tariffs ...