D. R. Hopkins,
“Impact de la DIEPA sur la dracunculose”, vol. no. 5. World Health Organization, Community Water Supply & Sanitation Unit, Geneva, Switzerland, p. 19 p.: fig., map, photogr., 1990.
D. R. Hopkins,
“Report on IDWSSD impact on dracunculiasis”, vol. no. 5. World Health Organization, Community Water Supply & Sanitation Unit, Geneva, Switzerland, p. 15 p. : fig., photogr., 1990.