Sampling deep ore deposits by rotary drilling and methods of surveying and controlling the direction of drill holes

Author: Trengove, Russell R.
Additional Authors: Johnson, A. C.
Year: 1956
Document Type: USBI
Issuing Agency: Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7768
Series: Information circular / United States. Bureau of Mines ;
Report Number: 7768
Subject: Rotary drilling
Link: https://hdl.handle.net/2027/mdp.39015078515437

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