00311nam a2200097Ia 4500008004100000082002400041100003500065245007500100260003000175300000800205140113s9999    xx            000 0 und d  a631.4(082.2)   L2.2  aIndian Society of Soil Science  aInternational symposoum on Soil fertility evaluation Proceedings vol.2  a1972bI.S.S.S.cNew Delhi  a157