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API Std 613

API Standard 613, Special Purpose Gear Units for Petroleum, Chemical and Gas Industry Services, Sixth Edition
standard by American Petroleum Institute, 07/01/2021

API Std 609

Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends, Ninth Edition
standard by American Petroleum Institute, 04/01/2021

API Spec 20E Errata 1

Errata 1 to Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries, Second Edition
Amendment by American Petroleum Institute, 11/04/2021