00405nam a22001217a 4500082001700000100003400017245003000051260005600081300000700137490004100144500004100185650005700226  a577.14 bCHE  aInstitute of Chemistry Ceylon  aChemist & The Environment  aColombobInstitute of Chemistry Ceylonc1972 July 7  a85  aTheme Seminar - 21 st Annual Session  aTheme Seminar - 21 st Annual Session  aTheme Seminar| 21 st Annual Session |Annual sessions