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 257 1,979
open 3271xx Clay Product and Refractory Manufacturing 56 498
open 3272xx Glass and Glass Product Manufacturing 77 588
open 3273xx Cement and Concrete Product Manufacturing 59 403
open 3274xx Lime and Gypsum Product Manufacturing 16 97
open 3279xx Other Nonmetallic Mineral Product Manufacturing 49 393
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