Changes

  | isbn    = 0891816607

  | isbn    = 0891816607

}}

}}

[[File:PinedaleFieldLandRig.png|thumb|Drilling rig in Pinedale field with the Wind River Mountains, Wyoming, USA in the background. Photo © by Douglas McCartney.]]

[[File:PinedaleFieldLandRig.png|thumb|300px|Drilling rig in Pinedale field with the Wind River Mountains, Wyoming, USA in the background. Photo © by Douglas McCartney.]]

==Parts of a rig==

==Parts of a rig==