Ключевые слова: abstract, age, annual, annual rings, background, bark, brown, clear, closeup, cross, cross section, cut, ecology, environment, european oak, firewood, forest, forestry, hardwood, harm, heartwood, industrial, log, logs, lumber, lumberjack, managed, material, natural, nature, pattern, pine, ring, sapwood, sawmill, sawn off, section, structure, stump, tanbark, texture, timber, tree, trunk, veluwe, wood, wood production, wood structure, wood texture, wooden,