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 270 2,070
open 3271xx Clay Product and Refractory Manufacturing 59 521
open 3272xx Glass and Glass Product Manufacturing 81 621
open 3273xx Cement and Concrete Product Manufacturing 63 428
open 3274xx Lime and Gypsum Product Manufacturing 17 102
open 3279xx Other Nonmetallic Mineral Product Manufacturing 50 398
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