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| 942 |
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|a 001.42
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| 100 |
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|a Vásquez Hidalgo, Antonio
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| 245 |
0 |
0 |
|a Guía metodológica para elaboración del protocolo de investigación
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| 260 |
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|a San Salvador :
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|c 1998
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| 300 |
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|a 8 p. ;
|b ilus
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| 650 |
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|a INVESTIGACION CIENTIFICA
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| 650 |
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|a PROTOCOLO DE INVESTIGACION
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