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	281.	No cover image available The iron deposit of cerro Huacravilca, Junín by Simons, Frank Bellido, Eleodoro Congreso nacional de geología, 1 ( 21-27 nov., 1955 : Lima) Material type: Article; Format: print Language: Eng In: Boletín de la Sociedad geológica del Perú 30, 1956, p. 359-374 : ill., carte, rés.(Esp) Availability: No items available.
	282.	No cover image available Algunas manifestaciones de minerales radiactivos y de las tierras raras, asociadas a pegmatitas en Corongo, Casma, Chosica y Atico by Morales Serrano, Guillermo Congreso nacional de geología, 2 ( 15-19 décembre 1960 : Lima) Material type: Article; Format: print Language: Spa In: Boletín de la Sociedad geológica del Perú 37, 1962, p. 109-129: : ill., carte, tab. Availability: No items available.
	283.	No cover image available Idaita - mineral de cobre en Yauricocha by Kobe, Huldrych Congreso nacional de geología, 2 ( 15-19 décembre 1960 : Lima) Material type: Article; Format: print Language: Spa In: Boletín de la Sociedad geológica del Perú 36, 1961, p. 103-114: : ill., graph. Availability: No items available.
	284.	No cover image available Investigaciones mineragráficas : umangita y klockmannita by Montreuil, Luis A. de Material type: Article; Format: print Language: Spa In: Boletín de la Sociedad geológica del Perú 55-56, 1977, p. 85-102: : ill., graph., tab. Availability: No items available.
	285.	No cover image available Mg-Fe exchange equilibria among Al-Cr spinel, olivine, orthopyroxene, and cordierite by Engi, Martin Material type: Text; Format: print ; Literary form: Not fiction Language: Eng Publication details: Zurich : Swiss Federal institute of technology Zurich, 1978 Dissertation note: Th. Doct Availability: Items available for loan: Biblioteca IFEA (1)Call number: Geol125. Place hold

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