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| 020 | _a0 471801925 | ||
| 037 | _cGeneral Book | ||
| 040 |
_aRTL _cRTL _beng |
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_2eng _aeng |
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| 082 | _aU671.73, J8;L1 | ||
| 100 |
_aSmith Guy Harold _9318915 |
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| 245 | 0 | _aConservation of natural resources | |
| 250 | _a4th | ||
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_aNew York _bJohn Wiley & Sons _c1971 |
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| 300 |
_axiii,685p. _ccm. |
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_hU671.73, J8;L1 _cGB _2CC |
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