TY  - BOOK
AU  - Department of  Science 
TI  - Physics;resorce book : G.C.E. (advanced level) unit 03 -oscillations and waves -grade 12
SN  - 978-955-654-898-3
PY  - 2020///
CY  - Department of  Science Publisher 
PB  - Maharagama 
ER  -