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 274 2,088
open 3271xx Clay Product and Refractory Manufacturing 61 528
open 3272xx Glass and Glass Product Manufacturing 81 621
open 3273xx Cement and Concrete Product Manufacturing 64 433
open 3274xx Lime and Gypsum Product Manufacturing 17 102
open 3279xx Other Nonmetallic Mineral Product Manufacturing 51 404
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