TY  - BOOK
AU  - à¤¬à¤¿à¤·à¥à¤, à¤¸à¥à¤à¤¾à¤¤à¤¾ 
TI  - à¤ªà¤°à¥à¤¯à¤¾à¤µà¤°à¤£ à¤¶à¤¿à¤à¥à¤·à¤¾
SN  - 817965060
U1  - 372.357 
PY  - 1991///
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PB  - à¤¤à¤à¥à¤·à¤¿à¤²à¤¾ à¤ªà¥à¤°à¤à¤¾à¤¶à¤¨ 
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KW  - learning environment
KW  - water pollution
ER  -