TY  - BOOK
AU  -  Roberts,Jean
AU  -  Duyan,Kenneth R.
TI  -  Visual acuity of children, United States / 
U1  -  312.0973 ROB 
PY  - 1970///
CY  -  Washington : 
PB  -  U.S. Health Services and Mental Health Administratio n, 
KW  -  Visual acuity
KW  -  United States
KW  -  Statistics
KW  -  Children with visual disabilities
KW  -  Statistics, Medical
N1  -  Includes bibliographical references: p. 15
ER  -