TY - BOOK ID - 135194281 TI - Refraction status of youths 12-17 years, United States AU - Roberts, Jean AU - Slaby, David AU - National Center for Health Statistics (U.S.) PY - 1974 PB - Rockville, Md. : U.S. Department of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics, DB - UniCat KW - Visual acuity KW - Heterophoria KW - Ophthalmic lenses KW - Youth KW - Health and hygiene KW - United States. UR - https://www.unicat.be/uniCat?func=search&query=sysid:135194281 AB - ER -