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by Pérez Luna, Enrique.
Published 2001
Subjects:
“...Science. Research and methodology....”Published 2001
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eBook
3
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by Guerra de León, José Orestes.
Published 2009
Subjects:
“...Social Science. Research....”Published 2009
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eBook
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by Domínguez Martínez, Raúl.
Published 1998
Subjects:
“...Science Research....”Published 1998
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eBook