| 000 | 00340nam a22000977a 4500 | ||
|---|---|---|---|
| 999 |
_c19020 _d19020 |
||
| 245 |
_aVisual acuity of youths 12-17 years : _bUnited States / _cUS Department of Health, Education, and Welfare |
||
| 260 |
_aMaryland : _bUS Department of Health, Education, and Welfare, _c1973. |
||
| 300 | _a44 p. | ||
| 650 |
_aVisual problems _vYouths |
||
| 942 | _cRB | ||