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  1. 1

    American Journal on Mental Retardations /

    Published 1994
    Journal
  2. 2

    American Journal of Mental Deficiency.

    Journal
  3. 3
  4. 4

    Mental subnormality / by Kekstadt, H

    Published 1973
    Book
  5. 5

    A study on the origins of mental retardation / by Ivanainen, Matti

    Published 1974
    Book