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| 005 | 20260205042147.0 | ||
| 008 | 260111s9999||||xx |||||||||||||| ||und|| | ||
| 100 | _aHOFF ARTHUR G | ||
| 245 | 0 | _aSECONDARY-SCHOOL SCIENCE TEACHING | |
| 260 |
_aTORONTO _bBLAKISTON _c1950 |
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| 300 | _a303 | ||
| 690 | _aSCIENCE;TEACHING | ||
| 942 | _cBK | ||
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_c28018 _d28018 |
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