Genetic studies in mental subnormality 
by B. C. Clare Davison ...(et al.), with a foreword by J. A. Fraser Roberts 
 - Ashford, Kent  Headley Brothers  1973 
 - 82 p. : ill. ; 25 cm. 
 - British journal of psychiatry. Special publication.  no. 8 .
<br/><br/>includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental deficiency<br/>Human genetics