Specification for rotary drilling equipment / American Petr-oleum Institute.
American Petroleum Institute
Specification for rotary drilling equipment / American Petr-oleum Institute. - Washington, D. C. : API - 98 p. - API specification ; 7 .
Specification for rotary drilling equipment / American Petr-oleum Institute. - Washington, D. C. : API - 98 p. - API specification ; 7 .