Fredrick, Mwanuzi. “Modelling of Agricultural Non-Point Sources Pollutants in Upper Pangani River Basin (UPRB), Tanzania”. Tanzania Journal of Engineering and Technology 30, no. 2 (December 31, 2007): 119-129. Accessed November 22, 2024. https://tjet.udsm.ac.tz/index.php/tjet/article/view/405.