Biblio

M. J. D. Graham and Mbwette, T. S. A., “Pilot plant evaluation of fabric-protected slow sand filters”, in Slow sand filtration : recent developments in water treatment technology, 1988, pp. P. 305-329: fig., tab., photogr.

A. Rudin and Plumtree, A., “Design for plastic hand pump and well”. Waterloo Research Institute, Waterloo, Ont, Canada, p. viii, 144 p.: fig., tab., 1978.