00467nam a22001577a 4500008004100000040005500041080002200096245006000118260003600178300001100214650001300225653001400238700002700252942001300279999001700292230712b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a616.899.001.5(05)  aInternational review of research in mental retardation   aLondon: bAcademic Press,c1968  a288p.   aScience   aResearch   aEllis, Norman R (Ed.)   2udccREF  c51899d51899