Ключевые слова: abstract, background, cement, damage, design, earth, erosion, gray, ground, hillside, industrial, interlock, landscaping, maintain, maintenance, material, move, movement, old, pattern, protect, protection, rain, retain, retaining, retaining wall, retention, rock, rough, shield, soil, stone, stones, strong, structure, surface, texture, vintage, wall, wallpaper, work,