TY  - GEN
AU  - Arudpragasam , K.D. 
AU  - Balasooriya , I. 
AU  -  Gunawrdena , N. J.
TI  - Environmental studies part II : the impact of human activities level 3 BTU 1120
U1  - 333.7 
CY  - Nugegoda
PB  - Open University
KW  - NATURAL ENVIRONMENT
KW  - ECONOMICS
ER  -