Lal, Rattan2019-09-022019-09-022009Lal, Rattan. The Plow and Agriculture / R. Lal // Journal of Sustainable Agriculture. – 2009. – Vol. 33. – P. 66-84. : il., tab.en-USAttribution-NonCommercial-NoDerivatives 4.0 InternationalAgriculturăOther