| 000 | 00395nam a2200109Ia 4500 | ||
|---|---|---|---|
| 008 | 200526s9999||||xx |||||||||||||| ||und|| | ||
| 082 | _a617.75 NAT | ||
| 245 | 0 | _aComparision of Two Vision Testing Devices: A Study to Compare Visual Acuity as Mesured By the Sight-Screener and the Sloan Letter Chart | |
| 264 |
_bU.S. Department of Health Education and Welfare _c1963 |
||
| 300 | _a33p. | ||
| 942 | _c | ||
| 999 |
_c11013 _d11013 |
||