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_aFEDL _beng _cFEDL |
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_aeng _2eng |
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_a001.434, RUS _qFEDL |
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| 100 | _aRusk Robert R | ||
| 245 | 0 | _aExperimental education | |
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_aLondon, UK _bLongmans, Green and Co. _c1919 |
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| 300 | _aviii,346p | ||
| 650 |
_aExperimental Research-Education _9757776 |
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_cTB _h001.434, RUS |
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