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American petroleum institute Api specification for high-strength casing, tubing, and drill pipe / American petroleum institute Dallas - American petroleum institute, 1976 Testo Monografico American petroleum institute Api specification for high-test line pipe / American petroleum institute Dallas - American petroleum institute, 1969 Testo Monografico American petroleum institute Api specification for high-test line pipe / American petroleum institute Dallas - American petroleum institute, 1971 Testo Monografico American petroleum institute Api specification for high-test line pipe / American petroleum institute Dallas - American petroleum institute, 1975 Testo Monografico American petroleum institute Api specification for high-test line pipe / American petroleum institute Dallas - American petroleum institute, 1978 Testo Monografico American petroleum institute API specification for indirect type oil field heaters / American petroleum institute Dallas - American petroleum institute, 1972 Testo Monografico American petroleum institute Api specification for inspection of external and internal threads / American petroleum institute Dallas - American petroleum institute, 1954 Testo Monografico American petroleum institute Api specification for line pipe / American petroleum institute Dallas - American petroleum institute, 1971 Testo Monografico American petroleum institute Api specification for line pipe / American petroleum institute Dallas - American petroleum institute, 1978 Testo Monografico American petroleum institute API specification for line pipe - (combination of former spec 5L, 5LS and 5LX) / American petroleum institute Dallas - American petroleum institute, 1983 Testo Monografico American petroleum institute API specification for materials and testing for well cements / American petroleum institute Dallas - American petroleum institute, 1982 Testo Monografico American petroleum institute API specification for oil and gas separators / American petroleum institute Dallas - American petroleum institute, 1982 Testo Monografico American petroleum institute API specification for oil-well drilling-fluid materials / American petroleum institute Dallas - American petroleum institute, 1966 Testo Monografico American petroleum institute API specification for oil-well drilling-fluid materials / American petroleum institute Dallas - American petroleum institute, 1983 Testo Monografico American petroleum institute API specification for polyethylene line pipe (PE) / American petroleum institute Dallas - American petroleum institute, 1981 Testo Monografico