00377nam a2200133Ia 4500008004100000082001700041100001900058245002500077260004500102300000800147650004100155650003400196653001300230170901s1976    xx            000 0 und d  a631.84bK94N  aKoren'Kov, D.A 0aNitrogen Fertilizers  aNew DelhibOxonian Press Pvt. Ltd.c1976  a309  aAgriculture and related technologies  aTechnology (Applied sciences)  aNitrogen