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North American Industry Classification System (NAICS) 1997

21232 - Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying
212323 - Sand and Gravel Mining and Quarrying
212326 - Shale, Clay and Refractory Mineral Mining and Quarrying

21232 - Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying
212323 - Sand and Gravel Mining and Quarrying
212326 - Shale, Clay and Refractory Mineral Mining and Quarrying

Date modified:: 2018-03-26