TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Specification for drilling and well servicing structures: API specification 4F
U1  - Caja 1-C 
PY  - 2020///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normalización
KW  - Normas API
N1  - Incluye adenda de agosto 2023
ER  -