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Types of concrete — There are many types of concrete, variations of installation, composition, finish and performance characteristics. A highway paved with concrete … Wikipedia
Drywall — For the musical group, see Drywall (musical project). Vertically hung drywall with joint compound. Drywall, also known as plasterboard, wallboard or gypsum board is a panel made of gypsum plaster pressed between two thick sheets of paper. It is… … Wikipedia

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