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	1.	Further studies on the properties of unproductive soils. By Burton Edward Livingston, assisted by Charles A. Jensen, J.F. Breazeale, F.R. Pember, and J.J. Skinner. by Livingston, Burton E. (Burton Edward), 1875-1948 Jensen, Charles A Breazeale, J. F. (James Frank), 1874-1950 Pember, F. R Skinner, J. J. (Joshua John), 1882-1969 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, Govt. print. off., 1907 Availability: No items available. Add to cart (remove)
	2.	Seasonal nitrification as influenced by crops and tillage. By C. A. Jensen... by Jensen, Charles A Series: United States. Bulletin ; 173. Material type: Text; Format: print available online ; Literary form: Not fiction Publication details: Washington, Govt. print. off., 1910 Online resources: Click here to access online Availability: No items available. Add to cart (remove)

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