Rotary drilling

Original Record:	http://hdl.handle.net/2374.OBE/101
Title:	Rotary drilling
Author:	Unknown author
Description:	Closer shot of table and derrick at end of drill rig in gh2o67 that are used to turn and lower the rotary drill bit.
Subject:	Ground water; Engineering geology; Geothermal; Drilling; Water supply
Rights:	World
Identifier:	simonb-gh2o069; http://hdl.handle.net/2374.OBE/101

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