API Spec 20A Errata 1
Errata to Carbon Steel, Alloy Steel, Stainless Steel, and Nickel Base Alloy Castings for Use in the Petroleum and Natural Gas Industry, First Edition, Includes Addendum 1 (2013), Addendum 2 (2015), Errata 1, August 2015
Amendment by American Petroleum Institute, 08/01/2015