Dawood Hama- Ameen, .S. and Rasul Younis , Y. 2022. Performance efficiency Evaluation of a Mass factory for iron and steel production in Sulaymaniyah Governorate for the period (2015-2020). Zanco Journal of Human Sciences. 26, 2 (Mar. 2022), 90–110. DOI:https://doi.org/10.21271/zjhs.26.2.7.