1. Adekeye JID, Ntekim EE (2007) The geochemistry and petrogenesis of basaltic rocks of central part of Yola basin, upper Benue Trough, Nigeria, Continental. J Earth Sci 1:1–10
2. Akuh TL, Alagba SA, Ibrahim AA (2014) Evaluation of groundwater suitability for drinking, domestic and irrigation purposes. A case study of Makurdi metropolis and environs Benue State north central Nigeria. Afr J Environ Sci Technol 8:610–622
3. Alloway BJ, Ayres DC (1993) Chemical principles of environmental pollution. Blackie Academic and Professional, Chapman and Hall, Bishopbriggs, Glasgow, pp 1–291
4. Annual Abstract of Statistics (2011) National Bureau of Statistics. Federal Republic of Nigeria. http://www.nigerianstat.gov.ng/pdfuploads/annual%20_abstract_2011 . Accessed 12 June 2016
5. Banks D, Hall G, Reimanna C, Siewers U (1999) Distribution of rare earth elements in crystalline bedrock groundwaters: Oslo and Bergen regions, Norway. Appl Geochem 14:27–39