TY  - GEN
AU  - Sriyananda , H. 
AU  - Karunaratne , H. 
AU  - Silva , H.D.J.
AU  -  Karunaratne , S.
AU  -  Gammampila , G.R. 
TI  - Physical science: diploma in technology level two one full credit course book 2 blocks 4, 5 ,6
U1  - 530 
PY  - 1986///
CY  - Nugegoda
PB  - Open University
KW  - PHYSICS
ER  -