Drillability determination
Subtitle: a drillability index for percussion drills
By: by Sathit Tandanand and Harold F. Unger.
Contributors: Unger, Harold F., joint author.; United States. Bureau of Mines
Series: Report of investigations - Bureau of Mines -- 8073
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1975
Place of publication: Pittsburgh
Language: eng
Number of pages: 20
Subjects: Drilling and boring.; Mining machinery.
Notes: Bibliography: p. 20.