00501nam a2200145Ia 4500008004100000020001400041040004400055100001800099245008300117260003700200300003500237500004900272700001900321999001500340180412s9999||||xx |||||||||||||| ||und||  a283352655  aAhmadu Bello University Library - Zaria  aPenrose, L.S. 4aThe Biology of Mental Defectcby L.S. Penrose with a preface by J.B.S. Haldene  aLondonbSidgwick & Jacksonc1972  axx, 416p.: ill., diagr., table  aInclude bibliographical references and index  aHaldane J.B.S.  c2629d2629