00314nam a2200097Ia 4500008004100000082002300041100001900064245007300083260005200156300000800208140113s9999    xx            000 0 und d  a631.415.2(540)  L6  a"Biswas, T.D."  a"Acid Soils of India :Their genesis, characteristics and management"  a1976bIndian Society of Soil SciencecNew Delhi  a308