Biblio

C. Edwards, “The coil pump : its potential as a low cost water lifting device”. University of East Anglia, School of Development Studies, Norwich, UK, p. 49 p. : fig., 1993.

D. J. Hilton, “Further development of the inclined coil pump”, Waterlines, an international journal of water, sanitation and waste, pp. p. 20-22: fig., photogr., 1989.