#757742Device for studying optical phenomena. Institute of Defectology, Academy of Pedagogical Sciences of the USSR.Sign in or register,to downloadAdd to cartRemove from cartCategories: Health, Science & TechnologyLocation: Moscow, RussiaEvent date: 01.01.1970Date published: 11.09.2010Author: Aleksandr NevezhinCredit: SputnikSource: SputnikOriginal: А70-28235, 35 mm filmMedia: JPEG, 3498x4933px, 4.7Mbcorrectiondevicediagnosticspedagogicsresearchspeechtechnologyvision