Oladeji, O. O., Tian, G., Cox, A. E., Granato, T. C., Pietz, R. I., Carlson, C. R., & 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)