Minimum tillage planting apparatus

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Title:	Minimum tillage planting apparatus
Date:	1986
Citation:	Beasley, E. O. (1986). Minimum tillage planting apparatus. U.S. Patent No. 4601248. Washington, DC: U.S. Patent and Trademark Office.
URI:	http://www.lib.ncsu.edu/resolver/1840.2/1882



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