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| 040 |
_e88537 _aMAIN |
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| 041 | _aEnglish | ||
| 082 | _a363.7 S75U | ||
| 100 | _aSethi, M S | ||
| 245 | 0 | _aUnderstanding our environment | |
| 260 |
_aNew Delhi _bCommonwealth _c1991 |
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| 300 | _axv, 440 p. | ||
| 942 | _cBK | ||
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_c81828 _d81828 |
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