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245	0	0	_aRig tracking service analyzes land drilling dynamics
270			_a12/09/06 ; 06/09/2004
300			_a2 p.
773	0		_tWorld Oil _gVol. 225, no. 8 (agos. 20034) ; p. 33-34
942			_cARTICULO
100	1		_aMason, Richard _933503
999			_c161369 _d161369