Versions of Iowa Code 185C.20 - Producers only to vote on LawServer 2023 Iowa Code 185C.20 – Producers only to vote 2022 Iowa Code 185C.20 – Producers only to vote 2020 Iowa Code 185C.20 – Producers only to vote 2018 Iowa Code 185C.20 – Producers only to vote 2016 Iowa Code 185C.20 – Producers only to vote 2014 Iowa Code 185C.20 – Producers only to vote. 2009 Iowa Code 185C.20 – Producers only to vote