| Business | Phone |
| Venable Royalty Ltd 5910 N Central Expy 1470, Dallas 75206 | (214) 750-7508 |
| Harry B Heutel 2626 Cole Ave 400, Dallas 75204 | (214) 665-9430 |
| Champion Winkler Oil Corp 3428 Drexel Dr, Dallas 75205 | (214) 526-0046 |
| Murdock Oper 1 Ltd Partnership 1920 Abrams Pkwy, Dallas 75214 | (214) 324-7546 |
| Marine Petroleum Trust Po Box 830241, Dallas 75283 | (972) 386-0159 |