Ngosi RK, Omwenga J. Factors Contributing to Non-Productive Time in Geothermal Drilling in Kenya: A Case of Menengai Geothermal Project. ASRJETS-Journal. 2015;14(3):16-26. Accessed November 3, 2025. https://asrjetsjournal.org/American_Scientific_Journal/article/view/1092