| 000 | 00343nam a2200121Ia 4500 | ||
|---|---|---|---|
| 008 | 200526s9999||||xx |||||||||||||| ||und|| | ||
| 082 | _a616.855 4 PER | ||
| 100 | _aPerkins, William H. | ||
| 245 | 0 | _aWhite House Conference on Mental Retardation 1963 | |
| 264 | _bU.S. Department of Health Education and Welfare | ||
| 300 | _a153p. | ||
| 942 | _c | ||
| 999 |
_c10904 _d10904 |
||