Publication Prevention of blindness in leprosy. Courtright P, Johnson G J. The International Centre for Eye Health. 1991;
Publication Effects of improved water supply and sanitation on ascariasis, diarrhoea, dracunculiasis, hookworm infection, schistosomiasis, and trachoma. Esrey S A, Potash J B, Roberts L, et al. Bulletin of the World Health Organization. 1991; 69 (5) : 609-21. Download PDF