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Purpura, Dominick P.; And Others – 1981
Evidence today indicates that the causes of mental retardation are biological, psychological, and social in origin and that a combination of these causes frequently occur in a single individual. Mental retardation is identified clinically by the presence of several signs that include, but are not limited to, a significant impairment of…
Descriptors: Behavioral Sciences, Biochemistry, Biology, Biomechanics
