Kekeba, Shimelis Kebede. 2019. “Concentrations of Some Heavy Metals (Lead, Cadmium, Copper and Zinc) in High Traffic Density Roadside Soils in Selected Towns of Oromia Regional State, Ethiopia”. The International Journal of Science & Technoledge 7 (3). https://doi.org/10.24940/theijst/2019/v7/i3/ST1903-021.