W Economic sectors > W.06 Manufacturing industries > W.06.06 Oil industry > Petroleum extraction

W Economic sectors > W.06 Manufacturing industries > W.06.06 Oil industry > Oil industry > Petroleum extraction

... > V Economics > V.12 Environmental and resource economics > V.12.02 Energy economics > Energy sector > Oil industry > Petroleum extraction

... > W Economic sectors > W.22 Public sector > Public utilities > Energy sector > Oil industry > Petroleum extraction

... > W Economic sectors > W.04 Energy and Water Industries > W.04.01 Energy sector > Energy sector > Oil industry > Petroleum extraction

V Economics > V.12 Environmental and resource economics > V.12.03 Resource economics > Resources sector > Petroleum extraction

W Economic sectors > W.05 Resource Sector and Mining > Resources sector > Petroleum extraction

W Economic sectors > W.05 Resource Sector and Mining > W.05.01 Mining > W.05.01.02 Crude Petroleum and Natural Gas Production > Petroleum extraction