T. F. Bastemeijer and Lee, M. D.,
“Drinking-water source deterioration : an urgent problem”,
Waterlines, an international journal of water, sanitation and waste, pp. p. 9-12: 1 fig., 4 photogr., 1992.
T. F. Bastemeijer and Lee, M. D.,
“Drinking-water source deterioration : an urgent problem : part 2”,
Waterlines, an international journal of water, sanitation and waste, pp. p. 22-25: 1 photogr., 2 tab., 1992.