Ключевые слова: above, advanced, alternative, alternative fuel, angle, background, bale, bar, brick, briquette, brown, burn, cake, cut out, front, fuel, fuels, group, heat, industry, isolate, isolated, light, material, nonconventional, object, peat, peat briquettes, production, raw, raw material, rectangular, several, shadow, shape, substances, three, vegetable, view, white,