Principles of Agronomy - T. Yellamanda Reddy; G.H. Shankara Reddy (Ludhiana Kalyani Publishers, 2002)
T. Yellamanda Reddy & G.H. Shankara Reddy: Principles of Agronomy. (3rd Ed) Ludhiana. Kalyani Publishers, 2002. 81-272-0282-7 81-7663-052-7--(630YEL)
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