A guide to the development of on-site sanitation / Franceys, R Pickford, John Aston Reed, R World Health Organization Sewerage, Rural Sewage disposal, Rural Outhouses Developing Countries Sanitation Sewage Toilet Facilities 628 WOR 1992 C152 Or. Includes index Geneva : World Health Organizaton, 1992 1992 Text viii, 237 p. :