TY  - BOOK
AU  - Graff, Heinz  .
TI  - Vaidhyutha engineering adhishtitha tatwangal, Vol 2 / 
U1  - 621.3 
PY  - 1975///
CY  - Thiruvananthapuram : 
PB  - State Instititute of Languages , 
ER  -