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	1.		Effects of conservation tillage on groundwater quality : nitrates and pesticides / edited by Terry J. Logan ... [et al.]. by Logan, Terry J Material type: Text; Format: print ; Literary form: Not fiction Publication details: Chelsea, Mich. : Lewis Publishers, c1987 Availability: Items available for loan: USPCAS-W Seminar Library (1)Call number: 631.51 LOG. Place hold
	2.		Effects of conservation tillage on groundwater quality : nitrates and pesticides / edited by Terry J. Logan ... [et al.]. by Logan, Terry J Publication details: Chelsea, Mich. : Lewis Publishers, c1987 Availability: No items available.

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