| Business | Phone |
| Hills Exploration Corp 490 Post St, San Francisco 94102 | (415) 296-7247 |
| Peregrine Oil & Gas Inc 505 Sansome St, San Francisco 94111 | (415) 579-6061 |
| Rail Net 1 Embarcadero Ctr, San Francisco 94111 | (415) 733-7800 |
| Towne Exploration Co 582 Market St # 1500, San Francisco 94104 | (415) 434-0700 |