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|a Conferencia Internacional del trabajo, 25. Ginebra, 1939
|9 97895
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| 245 |
1 |
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|a Enseñanza técnica y profesional y aprendizaje. Primera cuestion del orden del día
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| 260 |
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|a Ginebra :
|b Oficina Internacional del Trabajo (OIT),
|c 1938.
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|a 13 p. ;
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|a Cuestionario ;
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