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	1.	Image from Amazon.com	Ecology and field biology / Robert Leo Smith. by Smith, Robert Leo Edition: 2nd edition. Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York : Harper & Row Publishers, c1974 Availability: Items available for loan: PSAU OLM (1)Call number: C 574.5 Sm64 1974. Place hold Save to lists Add to cart (remove)
	2.	Image from Amazon.com	Elements of ecology / Thomas M. Smith, Robert Leo Smith. by Smith, Thomas M. (Thomas Michael) Smith, Robert Leo Edition: Eighth edition. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Singapore : Pearson Education Incorporated, c2012 Availability: Items available for loan: PSAU OLM (1)Call number: R 577 Sm66 2012. Place hold Save to lists Add to cart (remove)

Pampanga State Agricultural University