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		No cover image available Directrices para la evaluación de seminarios, reuniones de trabajos prácticos y cursos de formación sobre información y documentación científicas y técnicas / por F.W. Lancaster. by Lancaster, F.W Series: SC.75/ WS ; 44 Material type: Text; Literary form: Not fiction Publication details: París : UNESCO, 1975 Availability: No items available.
		No cover image available Guidelines on the planning of national scientific and technological information system/ by Carl Keren. by Keren, Carl Series: SC/75/WS/39 Material type: Text; Literary form: Not fiction Publication details: Paris: UNESCO, 1975 Availability: Not available: Bib. Gregorio Torres Quintero: UNESCO (1).

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