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| 037 | _cTextual | ||
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_aSDCL _cSDCL _beng |
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_2eng _aeng |
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| 082 | _aS:f, L9 | ||
| 100 |
_aCook Thomas D _9450615 |
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| 245 | 0 |
_aQuasi-experimentation _b Design & analysis issues for field settings. |
|
| 260 |
_aChicago _bRand McNally College Publishing _c1979 |
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_axii,405p. _ccm. |
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_a Campbell Donald T _9450616 |
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