Versions of Iowa Code 542B.17 - Engineer\'s certificate on LawServer 2023 Iowa Code 542B.17 – Engineer’s certificate 2022 Iowa Code 542B.17 – Engineer’s certificate. 2020 Iowa Code 542B.17 – Engineer’s certificate. 2018 Iowa Code 542B.17 – Engineer’s certificate. 2016 Iowa Code 542B.17 – Engineer 2014 Iowa Code 542B.17 – Engineer’s certificate. 2009 Iowa Code 542B.17 – Certificate