“STRUCTURE AND PROPERTIES OF FIR (ABIES BORISII – REGIS MATTF.) AND SPRUCE (PICEA EXCELSA LINK) AND THEIR INFLUENCE ON WOΟD IMPREGNABILITY*” (2026) Innovation in Woodworking Industry and Engineering design, 3(2). Available at: http://innojs.ltu.bg/index.php/scjournal-inno/article/view/178 (Accessed: 25 February 2026).