The North American Industry Classification System NAICS is a system for classifying industries by a six-digit code. [Wikipedia]
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TOP Description Asmts Reccs
327xxx Nonmetallic Mineral Product Manufacturing 279 2,123
open 3271xx Clay Product and Refractory Manufacturing 62 535
open 3272xx Glass and Glass Product Manufacturing 82 628
open 3273xx Cement and Concrete Product Manufacturing 66 449
open 3274xx Lime and Gypsum Product Manufacturing 17 102
open 3279xx Other Nonmetallic Mineral Product Manufacturing 52 409
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