TY  - BOOK
AU  - Rao, V.A. Seshagiri
TI  - Step by step classification: (a formula based classification) 
SN  - 9788193359792   (vol.1 & 2)
U1  - 025.42 
PY  - 2017///
CY  - New Delhi 
PB  - Ess Ess Publications
N1  - Vol.1 - Chapter A-C
Vol.2 - Chapter D-E
ER  -