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	1.	No cover image available Stratigraphy, sedimentation, paleogeography and paleoclimates of carboniferous ("Gondwana") and Permian of Bolivia by Helwig, James Material type: Article; Format: print Language: Eng American association of petroleum geologists bulletin 56(6), 1972, p. 1008-1033: : ill., carte, tab. Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.GeolH-7. Place hold
	2.	No cover image available Late paleozoic stratigraphy and tectonics of the Central Andes by Helwig, James Material type: Article; Format: print Language: Eng Anaès academia brasileira de ciências 44, 1972, p. 161-171: : ill., carte Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.GeolH-6. Place hold

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