Year of Publishing: 1987
Publisher: Sarvodaya Rural Technical Services
Institution: Lanka Jathika Sarvodaya Shramadana Sangamaya
Author: ODA Groundwater Team
Year of Publishing: 1982
Author: LAVER, S.
Year of Publishing: 1980
Institution: GTZ, Blair Research Laboratory
Author: BRUSH, R. E.
Year of Publishing: 1979
Publisher: Peace Corps
Institution: Information Collection & Exchange