00300nam a2200097Ia 4500008004100000082002700041100003500068245005700103260003400160300000800194140113s9999    xx            000 0 und d  a631.445.52/53(02)   K8  aU.S. Department of Agriculture  aDiagnosis and improvement of saline and alkali soils  a1976bOxford & IBHcNew Delhi  a160