Sand, gravel, crushed stone, asphalt, bitumen, cement, gypsum for use in construction, road construction, repair and covering work; building materials as finished products, namely, slabs, pre-cast wall forms, poles, made of concrete, gypsum, clay, potters' clay, natural or artificial stone, wood, plastics and synthetic materials for building, construction, road construction purposes; portable non-metallic buildings; non-metallic building materials in the nature of soffits, fascia, shutters; n...