 |
| Big Bend National Park, TX, |
| Photographer: NPS photo |
| Description: Heavy metals contaminate the ruins of this mill and retort at an abandoned mercury mine, Big Bend National Park, TX |
|
| Big Bend National Park, TX, |
| Photographer: NPS photo |
| Description: Heavy metals contaminate the ruins of this mill and retort at an abandoned mercury mine, Big Bend National Park, TX |