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by Nancy Daniels
| ![Oklahoma Drilling Rig 2011](https://a4.pbase.com/g4/90/665890/3/136441808.4PIfVuXA.jpg) Oklahoma Drilling Rig 2011
by Roger Parson
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by Paul Kalich
| ![Water Well Drilling in Tres Islas on the Chimore River, Cochabamba, Bolivia](https://a4.pbase.com/g1/28/527328/3/109132309.eoQQ4Rh0.jpg) Water Well Drilling in Tres Islas on the Chimore River, Cochabamba, Bolivia
by Daniel Beams
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