TY  - GEN
AU  - Agrahari, Ravi P. 
TI  - Science and technology for civil services preliminary and main examinations
SN  - 9789355325556
PY  - 2024///
CY  - Chennai.
PB  - Mc Graw Hill.
KW  - Civil services examination
KW  - Science and technology
KW  - Competitive examination guide
ER  -