This major group includes establishments engaged in manufacturing flat glass and other glass products, cement, structural clay products, pottery, concrete and gypsum products, cut stone, abrasive and asbestos products, and other products from materials taken principally from the earth in the form of stone, clay, and sand. When separate reports are available for mines and quarries operated by manufacturing establishments classified in this major group, the mining and quarrying activities are classified in Division B, Mining. When separate reports are not available, the mining and quarrying activities, other than those of Industry 3295, are classified herein with the manufacturing operations.

If separate reports are not available for crushing, grinding, and other preparation activities of Industry 3295, these establishments are classified in Division B, Mining.
Industry Group 321: Flat Glass
·3211 Flat Glass
Industry Group 322: Glass And Glassware, Pressed Or Blown
·3221 Glass Containers
·3229 Pressed and Blown Glass and Glassware, Not Elsewhere Classified
Industry Group 323: Glass Products, Made Of Purchased Glass
·3231 Glass Products, Made of Purchased Glass
Industry Group 324: Cement, Hydraulic
·3241 Cement, Hydraulic
Industry Group 325: Structural Clay Products
·3251 Brick and Structural Clay Tile
·3253 Ceramic Wall and Floor Tile
·3255 Clay Refractories
·3259 Structural Clay Products, Not Elsewhere Classified
Industry Group 326: Pottery And Related Products
·3261 Vitreous China Plumbing Fixtures and China and Earthenware Fittings and Bathroom Accessories
·3262 Vitreous China Table and Kitchen Articles
·3263 Fine Earthenware (Whiteware) Table and Kitchen Articles
·3264 Porcelain Electrical Supplies
·3269 Pottery Products, Not Elsewhere Classified
Industry Group 327: Concrete, Gypsum, And Plaster Products
·3271 Concrete Block and Brick
·3272 Concrete Products, Except Block and Brick
·3273 Ready-Mixed Concrete
·3274 Lime
·3275 Gypsum Products
Industry Group 328: Cut Stone And Stone Products
·3281 Cut Stone and Stone Products
Industry Group 329: Abrasive, Asbestos, And Miscellaneous
·3291 Abrasive Products
·3292 Asbestos Products
·3295 Minerals and Earths, Ground or Otherwise Treated
·3296 Mineral Wool
·3297 Nonclay Refractories
·3299 Nonmetallic Mineral Products, Not Elsewhere Classified

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