Ugwuonah, E. and Obiora, C. 2015. Geothermometric and Geobarometric signatures of metamorphism in the Precambrian basement complex rocks around Keffi, north-central Nigeria. Ghana Journal of Science. 51, 1 (May 2015), 73–87. DOI:https://doi.org/10.4314/gjs.v51i1.