The drill stem

Eitemau Tebyg

• The blocks and drilling line
  gan: University of Texas. Petroleum Extension Service
  Cyhoeddwyd: (1981)
• The rotary rig and its components
  gan: University of Texas. Petroleum Extension Service
  Cyhoeddwyd: (1976)
• Safety on the rig
  gan: University of Texas. Petroleum Extension Service
  Cyhoeddwyd: (1976)
• The hoisting tools : blocks, hook and wire line
  gan: University of Texas. Petroleum Extension Service, et al.
  Cyhoeddwyd: (1966)
• Handling drill pipes, drill collars and tool joints [filem]
  Cyhoeddwyd: ([n.d)