NAICS 211120
Crude Petroleum Extraction
This industry comprises establishments primarily engaged in (1) the exploration, development, and/or the production of petroleum from wells in which the hydrocarbons will initially flow or can be produced using normal or enhanced drilling and extraction techniques or (2) the production of crude petroleum from surface…
Inside Crude Petroleum Extraction
Nothing is classified below Crude Petroleum Extraction. Its organizations are in the registry; its schema is one link above.