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_aTendencias de la investigación en las ciencias sociales / _cJean Piaget... [et al.] |
| 250 | _a4a. ed. | ||
| 260 |
_aMadrid : _bAlianza : _bUNESCO, _c1979 |
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_aCIENCIAS SOCIALES _xINVESTIGACION |
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_aPiaget, Jean, _ecoaut. |
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_aAlianza Universidad ; _v45 |
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