Using the Biological Condition Gradient Model as a Bioassessment Framework to Support Rehabilitation and Restoration of the Upper Tana River Watershed in Kenya oleh George G. Ndiritu, George G. Ndiritu, Taita Terer, Peter Njoroge, Veronica M. Muiruri, Edward L. Njagi, Gilbert Kosgei, Laban Njoroge, Peris W. Kamau, Patrick K. Malonza, Mary Muchane, Joseph Gathua, Dickens Odeny, David Courtemanch