00434nam a2200145Ia 4500008004100000082001800041100001900059245006700078250000600145260003400151300000800185650004100193650003400234653002000268170901s1957    xx            000 0 und d  a636.082bN55L  aNichols, J. E. 0aLivestock ImprovementbIn relation to Heredity and Environment  a4  aLondonbOliver and Boydc1957  a240  aAgriculture and related technologies  aTechnology (Applied sciences)  aAnimal breeding