| 213112 |
Well pumping, oil and gas field, on a contract basis |
| 213112 |
Well servicing, oil and gas field, on a contract basis |
| 213112 |
Well surveying, oil and gas field, on a contract basis |
| 213112 |
Wireline services, oil and gas field, on a contract basis |
| 213113 |
Anthracite mine tunneling on a contract basis |
| 213113 |
Anthracite mining services on a contract basis (except geophysical surveying and mapping, site preparation, construction, and transportation activities) |
| 213113 |
Auger coal mining services on a contract basis (except geophysical surveying and mapping, site preparation, construction, and transportation activities) |
| 213113 |
Bituminous coal mining services on a contract basis (except geophysical surveying and mapping, site preparation, construction, and transportation activities) |
| 213113 |
Bituminous coal or lignite surface mine site development (except site preparation and related construction contractor activities) on a contract basis |
| 213113 |
Bituminous coal stripping service on a contract basis |