Development of a successful hard-surfaced bit for drilling oil shale

Author: Ertl, Tell.
Additional Authors: Burgh, Ernest E., Wagner, John R.,
Year: 1948
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:4177
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 4177
Subject: Bits (Drilling and boring)
Link: https://hdl.handle.net/2027/mdp.39015078480392

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