TY  - BOOK
AU  - Gupta's, R.
AU  - B.B. Singh
TI  - Objective environmental sciences: a comprehensive book for UGC/ICAR-NET,UPSC, PCS, banking, CPCB and other recruitment and entrance examinations 
SN  - 9788178129082
U1  - 000 
CY  - New Delhi
PB  - Ramesh Publishing House
KW  - Competetive exam
ER  -