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.:
backlog basis boot borer boring construction core cored cores coring depth depths device dredging drill drillhole drilling drillpipe drillpipes engine exploitation exploration exploratory exploring gall geological ground hole jumbo land machine obtaining operation pipe pipes planchet prospecting research retrieval rod sample science setup shear site soil steel stem string structure study texture tube well work