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	1.	No cover image available Preliminary observations on porphyry copper mineralization at la sierra - San Marino area, Choco, western Colombia by Chakrabarty, Ananda Durango, Jorge Congreso colombiano de geología, 2 ( 4-9 déc., 1978 : Bogotá) Material type: Article; Format: print ; Literary form: Not fiction Language: Spa In: II Congreso colombiano de geología : resúmenes p. 22 Availability: No items available.
	2.	No cover image available Geoquímica de las quebradas La Loma y Frias-Santa Barbara : ant by Durango, Jorge Congreso colombiano de geología, 2 ( 4-9 déc., 1978 : Bogotá) Material type: Article; Format: print ; Literary form: Not fiction Language: Spa In: II Congreso colombiano de geología : resúmenes p. 46 Availability: No items available.

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