Householders guide to selecting a pit latrine (1981) Cotton, Andrew; Training Programmes in Water Supply and Sanitation for Sri Lanka 1981-1985; Water, Engineering and Development Centre (WEDC); Sri Lanka, National Housing Development Authority
Pit latrines for Sri Lanka (1981) Cotton, Andrew; Training Programmes in Water Supply and Sanitation for Sri Lanka 1981-1985; Water, Engineering and Development Centre (WEDC); Sri Lanka, National Housing Development Authority
Training manual on rural water supply and sanitation (1981) Cotton, Andrew; Training Programmes in Water Supply and Sanitation for Sri Lanka 1981-1985; Water, Engineering and Development Centre (WEDC); Sri Lanka, National Housing Development Authority