North American Industry Classification System (NAICS) 1997
- 21 - Mining and Oil and Gas Extraction
- 212 - Mining (except Oil and Gas)
- 2123 - Non-Metallic Mineral Mining and Quarrying
- 21231 - Stone Mining and Quarrying
- 212314 - Granite Mining and Quarrying
- 212315 - Limestone Mining and Quarrying
- 212316 - Marble Mining and Quarrying
- 212317 - Sandstone Mining and Quarrying
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