TY  - BOOK
AU  - GKP
TI  - UPSC civil services courseware for preliminary and main examination: general science and science and technology 
U1  - 500 GKP 
PY  - 2019///
CY  - India
PB  - GK Publications
KW  - UPSC civil services
KW  - General science
KW  - Science and technology
KW  - Competitive exam
ER  -