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). http://innojs.ltu.bg/index.php/scjournal-inno/article/view/178