Biblio

T. S. Wood, “Simple assessment techniques for soil and water”. CODEL, Environment and Development Program, New York, NY, USA, p. iii, 31 p., 1981.

R. E. Jackson, Aquifer contamination and protection, vol. no. 30. Paris, France: UNESCO, 1980, p. 440 p.: fig., tab.

WHO -Geneva, CH, World Health Organization and Geneva, C. H. W. H. O. Diarrh, “Guidelines for the production of oral rehydration salts”. World Health Organization (WHO), Geneva, Switzerland, p. i, 58 p.: fig., 1980.