| Business | Phone |
| Petroleum Financial Inc 306 W 7th St, Fort Worth 76102 | (817) 339-1000 |
| Petroleum Geologist 3415 Indale Rd, Fort Worth 76116 | (817) 732-0929 |
| Petroleum Specialist Lab 2920 Marquita Dr, Fort Worth 76116 | (817) 244-3118 |
| William Smith 777 Taylor St Piig, Fort Worth 76102 | (817) 335-3593 |
| Strickland Group 512 Main St, Fort Worth 76102 | (817) 338-0800 |
| Arnold Ballard & Co 3309 Winthrop Ave, Fort Worth 76116 | (817) 731-1144 |
| Expro Engineering Co 3220 North Fwy 112, Fort Worth 76111 | (817) 624-8425 |
| Grant Rod & Co Inc 7217 Johnstone Ln, Fort Worth 76133 | (817) 294-1044 |
| Cornerstone Ng Engineering 616 Texas St, Fort Worth 76102 | (817) 348-0700 |
| Harper Associates Inc 307 W 7th St 905, Fort Worth 76102 | (817) 332-4552 |