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	1.	No cover image available Balanus in the Oligocene of Northern Peru and Western Ecuador by Olsson, Axel Pilsbry, Henry Material type: Article; Format: print ; Literary form: Not fiction Language: Spa In: Volumen jubilar : 25 aniversario, parte II p. 1-6 : ill. Availability: No items available.
	2.	No cover image available Contributions to the paleontology of Northern Peru : Part VII the cretaceous of the Paita region by Olsson, Axel Material type: Article; Format: print Language: Eng Bulletins of American paleontology 28(3), 1944, p. 5-146: : ill., carte, tab. Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.Paleo15. Place hold
	3.	No cover image available Contributions to the paleontology of Northern Peru : the cretaceous of the Amotape region by Olsson, Axel Material type: Article; Format: print Language: Eng Bulletins of american paleontology 20(69), 1934, p. 1-104: : ill., carte Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.PaleoO-2. Place hold

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