00834nam a22003257i 4500 20141212085831.0 870701s1987 sp gr 000 0 spa c 0145-482X (papel) 1559-1476 (online) eng SANTIS, V.DE BLINDNESS STATISTICS (PART 2):BLINDNESS REGISTERS IN THE UNITED STATES Ceguera Datos estadísticos Demografía Discapacidad Discapacidad visual EE.UU. Discapacidad Documental SCHEIN, J.D. JOURNAL OF VISUAL IMPAIRMENT AND BLINDNESS Vol. 80, no. 2 (1986), p. 570-576 11.4 49 G8 P3g AR 19870701 R.606 AR