O. Goetsch,
“Evaluation of water points and wells, constructed from 1964 to 1989”. Helvetas, Swiss Association for Development and Cooperation, Yaounde, Cameroon, p. 22 p.: fig., tab., 1989.
O. Goetsch,
“Evaluation of water supply systems, constructed from 1964 to 1989”. Helvetas, Swiss Association for Development and Cooperation, Yaounde, Cameroon, p. 41 p.: fig., tab., 1989.
