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_aeng _2eng |
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_a371.11, BRO _qFEDL |
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| 100 | _aBrown Kenneth E | ||
| 245 | 0 | _aQualifications and teaching loads of mathematics and science teachers | |
| 260 |
_aWashington, USA _bU.S. Government Printing Office _c1959 |
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| 300 | _a101p. | ||
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