API st 582:2001 pdf download
API Spec 16D:2004(2013) pdf download
API SPEC 15LR:2001(2013) pdf download
API SPEC 15HR:2001R2010 pdf download
API Spec 1581:2002 pdf download
API SPEC 12B:2008 pdf download
API SPEC 12D:2008 pdf download
API SPEC 6D:2008 pdf download
API RP 2216:2003(2010) pdf download
API RP 51:2001(2013) pdf download
API RP 13D:2006 pdf download