Ключевые слова: birch, birch wood, business, cargo, carrying, commercial, distribution, dock, ecology, exports, firewood, forest, fossil, freight, gradient, harbor, heap, horizontal, industrial, industry, loading, logs, lumber, material, merchandise, outdoors, pattern, pier, pine, plank, preparation, pulpwood, raw materials, renewable resource, resource, shipping, stack, stacking, station, storage, structure, tilt, timber, trading, transport, transportation, warehouse, wood pile, woods,