user- friendly field / laboratory manual Silva, E. I. L. creator Manuweera, L. Namaratne, S. Y. Weerasooriya, S. V. R. Kandy Institute of Foundamental Studies 1996 1996 v,193p. 26cm Chemistry and allied sciences Hydrogen and its Compounds Water Inorganic chemistry 546.22 WAT 9552600324