| Business | Phone |
| Altuda Energy Corp 401 Austin Hwy, San Antonio 78209 | (210) 829-8080 |
| National Petroleum Mgmt Assn 126 Jeanette Dr, San Antonio 78216 | (210) 832-9990 |
| Onyx Operating Inc San Antonio 78216 | (210) 349-6191 |
| Paul R Clevenger Petroleum 7701 Broadway St 700, San Antonio 78209 | (210) 822-2464 |
| Petroleum & Ranch Properties 13300 Blanco Rd, San Antonio 78216 | (210) 493-0385 |
| Pipeline Safety Inc San Antonio 78230 | (210) 696-4008 |
| William H Wood Po Box 6568, San Antonio 78209 | (210) 826-7616 |
| Petroleum Marketing Solutions 24123 Boerne Stage Rd, San Antonio 78255 | (210) 698-9559 |
| Wardlaw Appraisal Group 16601 Blanco Rd 100, San Antonio 78232 | (210) 408-0607 |