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)