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API SPEC 4F   2024   Specification for Drilling and Well Servicing Structures 80 $
API SPEC 4F   2020   Specification for Drilling and Well Servicing Structures 80 $
API SPEC 4F   2019   Specification for Drilling and Well Servicing Structures 80 $
API SPEC 4F   2013   Specification for Drilling and Well Servicing Structures 80 $
API SPEC 4F   2008   Specification for Drilling and Well Servicing Structures R(2001) 50 $
API SPEC 4F   1995   Specification for Drilling and Well Servicing Structures R(2001) 30 $