- Allen & Crouch Petroleum
- Bob Hoffmeyer Consultant
- Borah-Borah Petroleum Inc
- C Wayne Nance & Assoc Inc
- Caprock Engineers Inc
- Darita Enterprises
- Earl W Jones
- Englobal Corp
- Englobal Corp
- Extreme Petroleum Technology
- Flack Petroleum Consultants
- Grace Shursen Moore & Assoc
- Grace Shursen Moore & Assoc
- H P & T Products Inc
- Harold Neff & Assoc Inc
- Houston Atlas Engineering
- Houston Atlas Engineering
- Houston Atlas Engineering
- Houston Atlas Engineering
- Jack Slack Engineering Co
- James E Skidmore Consulting
- Larry O Hulsey & Co
- Larry O Hulsey & Co
- Lippman Consulting
- Martin Petroleum Corp
- Martin Petroleum Corp
- Mullen Energy Corp
- Osborn Engineering Inc
- QMSI Inc
- R E Son Inc
- R R Inc
- Ranger Operating Co
- Ranger Operating Co
- Riddle Engineering Corp
- Tarpley Engineering
- W L Gabelmann
- W L Gabelmann
- W Scott Epley & Assoc
