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	1.	No cover image available La evolución estructural de los Andes más septentrionales de Colombia by Irving, Earl Material type: Article; Format: print Language: Spa In: Boletín geológico 19(2), 1971, 89 p: : ill., carte, carte h. t., rés.(Spa, Eng, Fre, Ger) Availability: No items available.
	2.	No cover image available Conceptos preliminares sobre el desarrollo y uso de fertilizantes en Colombia by Irving, Earl Material type: Article; Format: print Language: Spa In: Boletín geológico 15(1-3), 1967, p. 163-174: : carte, rés.(Esp, Angl) Availability: No items available.
	3.	No cover image available Observations on the tectonic history of the northern most andes Colombia by Irving, Earl Congreso latinoamericano de geología, 1 ( 22-29 nov., 1970 : Lima) Material type: Article; Format: print ; Literary form: Not fiction Language: En In: Primer congreso latinoamericano de geología : resúmenes p. 250-252 Availability: No items available.
	4.	No cover image available Structural evolution of the northernmost Andes, Colombia by Irving, Earl Series: U. S. Geological survey professional paper, 846 Material type: Text; Format: print ; Literary form: Not fiction Language: Eng Publication details: Washington : U. S. Geological survey, 1975 Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.GeolI-7. Place hold

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