AU  - Kushhal,M.C..
TI  - Spectral Practicae / 
SN  - 0-7069-0359-5
U1  - 338.2 
PY  - 1975///
CY  - N.Delhi
PB  - Vikas Publishing House Pvt Ltd , 
KW  - Commerce
N1  - NULL
ER  -