Oladeji, O. ., Tian, G. ., Cox, A. ., Granato, T. ., Pietz, R. ., Carlson, C. ., & Abedin, Z. . (1969). Effects of long-term application of biosolids for mine land reclamation on groundwater chemistry: trace metals. Journal of Environmental Quality, 41(5), 1445-51. https://doi.org/10.2134/jeq2011.0472 (Original work published 1969)