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	1.	No cover image available A geologic reconnaissance of the Cuzco valley, Peru by Gregory, Herbert Material type: Article; Format: print Language: Eng American journal of science 41(241), 1916, p. 1-100: : ill., carte Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.GeolG-25. Place hold
	2.	No cover image available Geologic reconnaissance of the Ayusbamba (Peru) fossil beds by Gregory, Herbert Material type: Article; Format: print Language: Eng American journal of science 37(218), 1914, p. 125-140: : ill., carte Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.GeolG-26. Place hold

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