Text ( visual ) : unmediated Mental deficiency : the changing outlook / edited by Ann M. Clarke, Alan D. B. Clarke and Joseph M. Berg. -- 4th ed.. -- London : Methuen , c1985. -- xxiv,834 p. : ill. ; 24 cm. -- Previous ed.: 1974 ; Includes bibliographies and index. -- ISBN 041638160X ; (BA23111208) ; https://ci.nii.ac.jp/ncid/BA23111208 Author Heading(s): Clarke, Ann M. (Ann Margaret) ; Clarke, A. D. B. (Alan Douglas Benson) ; Berg, J. M. (Joseph Maurice). -- Classification(s): LCC : RC570 ; DC19 : 616.85/88. -- Subject Heading(s): PRECIS : Man. Mental retardation ; LCSH : Mental retardation

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