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	1.	No cover image available Petrology of fluvial sands from the Amazonian foreland basin, Peru and Bolivia : discussion and reply by Johnsson, Mark Stallard, Robert Lundberg, Neil DeCelles, P. G Hertel, F Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 102(12), 1990, p. 1727-1730: : ill. Availability: No items available.
	2.	No cover image available Controls on the composition of fluvial sands from a tropical weathering environment : sands of the Orinoco River drainage basin, Venezuela and Colombia by Johnsson, Mark Stallard, Robert Lundberg, Neil Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 103(12), 1991, p. 1622-1647: : ill., carte, graph., tab., rés.(Angl) Availability: No items available.

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