Biblio

J. G. Orozco, Alberts, H., Sandiford, P., and Gorter, A., “The Nicaraguan rope pump”, Waterlines, an international journal of water, sanitation and waste, pp. p. 27-30: 4 fig., ill., photogr., 1993.

P. Sandiford and Gorter, A., “Well water study : a consultancy undertaken for COWATER International Inc.”. Liverpool Associates in Tropical Health, Liverpool, UK, p. 30 p.: i fig., 6 tab., 1992.