00658nam 2200169z- 450 9910712707603321(CKB)5470000002497101(EXLCZ)99547000000249710120230509c1968uuuu -u- -engCharacteristics of visually impaired persons : United States - July 1963-June 1964U.S. Department of Health, Education, and Welfare, Public Health ServiceWashington, D.CCharacteristics of visually impaired persons BOOK9910712707603321Characteristics of visually impaired persons : United States - July 1963-June 19643307593UNINA