Diamond Drilling and Diamond Bit Investigation
Subtitle: Part 2. : Tests on Cast-Set Coring Bits.
Contributors: Obert, Leonard, 1906-; Agnew, W.; Gabriel, A.
Series: Report of investigations (United States. Bureau of Mines) -- 4233
Publisher: s.n
Published: 1948
Place of publication: S.l
Language: eng
Notes: 1