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The construction and utility of three indexes of intellectual achievement : an intellectual-development (ID) index, a socio-intellectual-status (SIS) index, a differential-intellectual-development (DID) index, U.S. children and youths, 6-17 years / [Harold J. Dupuy, Gunnar Gruvaeus].

Harold J Dupuy Gunnar Gruvaeus [author]

Hyattsville, Md. : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics 1977

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