TY  - GEN
AU  - Gupta , R.S.
AU  - Chchabra , P.C.
AU  - Kavathekar ,  A.K.
AU  - Saini , B.R.
TI  - Experimental physics: for class xl
U1  - 530 
PY  - 1990///
CY  - New Delhi
PB  - Frank Bros 
KW  - Physics
ER  -