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| 037 | _cGeneral Book | ||
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_aRTL _cRTL _beng |
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_2eng _aeng |
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_aDevellis Robert F _9292621 |
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_aScale development _b Theory and applications |
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_aLondon _bSage U K _c1991 |
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_a121p. Bib p. 115-18 _ccm. |
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| 490 | _aApplied Social Research Methods Series, 26 | ||
| 650 | _aSocial Sciences | ||
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