- Babson & Sheppard
- Barree & Assoc LLC
- Driltek Inc
- Driltek Inc
- Dunbar Inc
- Hazlett Engineering
- Hazlett Engineering
- Herbert E Wheeler Petroleum
- Industrial Gas Svc Inc
- Integrity Consulting
- International Reservoir Tech
- John J Wanner
- Jon Crawford Petro Engineer
- Koch Engineering Co
- Koch Engineering Co
- Lacy & Alford
- M J England & Assoc
- Mahogany Oil & Gas Co
- Mannon Associates
- Matthews
- Mc Cartney Engineering LLC
- Mha Petroleum Consultants
- Molli Computer Svc Inc
- Mountain Resources
- MVP Petroleum Engineering
- Petrotel Alaska
- Production Control Svc Inc
- Questa Engineering
- Reed W Ferrill & Assoc Inc
- Resource Consulting Intl Inc
- Ryder Scott Co Petroleum Engr
- Stephan R Smith
- V W Mc Knab
- Walt King Petroleum Engineers
- Walter C Pearson Jr
