2017API S1-2017 Organization and Procedures for the Committee on Standardization of Oilfield Equipment and Material: Policy Document (Twenty-fourth Edition; Send Customer Direct: https://www.api.org/products-and-services/standards/program-information/policies-and-procedu
1997API S1-1997 Organization and Procedures for Standardization of Oilfield Equipment and Materials (Nineteenth Edition)
1995API S1-1995 Organization and Procedures for Standardization of Oilfield Equipment and Materials (Eighteenth Edition)