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| 020 | _a858590077 | ||
| 082 |
_a333.7 _bHAR _223 |
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| 100 |
_aHARTMANN, H F _eetal |
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| 245 |
_aNature in the balance _c/ by H F Hartmann...[et al.] |
||
| 260 |
_aVictoria _bHeinemann educational Australia _c1974 |
||
| 300 | _a96 p. | ||
| 650 | _aEnviorenmental studies | ||
| 942 | _cS | ||