ID 160014592 © Joserpizarro | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
blackboard box classification classified construction cylinders depth documentation drilling engineering engineers fragments geological geology information infrastructure mining quartzite quartzites research rock samples sampling slate sounding spain specimens stone stones study subsoil survey surveys terrain testimonials tunnel tunnels well witnesses work