Frictional ignition with coal mining bits
By: by Welby G. Courtney.
Series: Information circular / Bureau of Mines ;; 9251; Information circular (United States. Bureau of Mines) ;; 9251.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1990
Place of publication: Washington, D.C
Language: eng
Number of pages: 25
Subjects: Coal-cutting bits -- Testing.; Friction.; Methane -- Combustion.
Notes: Includes bibliographical references (p. 25).