TY  - BOOK
AU  - Ravi P Agrahari
AU  - Ravi P. Agrahari
TI  - Science and Technology: For civil services Priliminary and mains examinatin 
SN  - 9789353160890
U1  - 500 
PY  - 2019///
CY  - New Delhi
PB  - McGraw Hill Education
ER  -