TY  - BOOK
AU  - Singh, D. N.
AU  - Singh, J.
TI  - AN INTRODUCTION TO OUR EARTH AN ENVIROMENT
U1  - 363.73 
PY  - 1988///
CY  - Varanasi
PB  - Environment And Development Study Centre
KW  - Earth
KW  - Ecology
KW  - Man -- Influnence Of Environment
ER  -