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	1.	No cover image available Estudio mineralógico sobre el asbesto boliviano by Ljunggren, Pontus Balderrama, Ismael Saavedra, Alberto Blacut, Wladimir Material type: Article; Format: print Language: Spa In: Boletín del Instituto boliviano del petróleo 5(1-2), 1965, p. 35-38: : graph., tab. Availability: No items available.
	2.	No cover image available Estudios técnicos sobre materias primas bolivianas : la magnesita del Alto Chapare - material refractorio by Ljunggren, Pontus Balderrama, Ismael Saavedra, Alberto Blacut, Wladimir Material type: Article; Format: print Language: Spa In: Boletín del Instituto boliviano del petróleo 5(1-2), 1965, p. 39-41 : graph. Availability: No items available.

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