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| 020 | _a0-415-07994-2 | ||
| 041 | _aeng | ||
| 082 | _a160 | ||
| 100 | _aSonford, Devid H. | ||
| 245 | _aIfp,Then G. Contitionels And The Foundations Of Reasoning | ||
| 260 |
_aLondon _bRontudge _c1992 |
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| 300 | _a265 p. | ||
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