TY  - BOOK
ED  - United States. Department of Health, Education, and Welfare. Public Health Service
TI  - Intellectual Development of Children,United States: : By Demographic and Socioeconomic Factors
T2  - Vital and Health Statistics.Series 11: Data from the National Health Survey, no.110
PY  - 1971///
CY  - Rockville, Md.
PB  - National Center for Health Statistics
ER  -