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	1.	Principles of field crop production [by] John H. Martin [and] Warren H. Leonard. by Martin, John H. (John Holmes), 1893- Leonard, Warren H, 1900- [joint author.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York, Macmillan Co., 1949 Availability: No items available. Add to cart (remove)
	2.	Field crops in Colorado, by Warren H. Leonard [and] Robert S. Whitney. by Leonard, Warren H, 1900- Whitney, Robert S. (Robert Shannon), 1912- [joint author.] Edition: [Rev. ed.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Minneapolis, Burgess Pub. Co. [1950] Availability: No items available. Add to cart (remove)

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