005820a00a22001930004500 National Science Council Journal of the National Science Council of Sri Lanka Q SLML:1(1973)-3(1975);4(1,2, 1976)-6(No. 1,2 1978);7(No. 2 1979);8(No. 1,2, 1980);-21(1,2 1993);22(1-4 1994);23(1,3,4 1995);24(No. 1,2 1996) Colombo:National Science Council 1973 1996 S C ddc 5396 5396 SLMLJNL REF SLMLJ SLMLJ678508 2020-09-20 0 ddc SLML SLML 0 0 2020-09-20 0 2