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  Industrial Directory By SIC Codes
Mining
Coal/Lignite Mining    (sic code 12 / 41 companies)
Forestry    (sic code 14 / 448 companies)
Metal Mining    (sic code 10 / 34 companies)
Oil and gas extraction (SIC Code 13)
  Crude Petroleum and Natural Gas
     - sic code 1311  / 186 companies
 
  Drilling Oil and Gas Wells
     - sic code 1381  / 130 companies
 
  Natural Gas Liquids
     - sic code 1321  / 15 companies
 
  Oil and Gas Field Exploration Services
     - sic code 1382  / 198 companies
 
  Oil and Gas Field Services, NEC
     - sic code 1389  / 394 companies
 

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