File:Education of defectives (IA educationofdefec00alle).pdf
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![File:Education of defectives (IA educationofdefec00alle).pdf](https://cdn.statically.io/img/upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Education_of_defectives_%28IA_educationofdefec00alle%29.pdf/page1-399px-Education_of_defectives_%28IA_educationofdefec00alle%29.pdf.jpg?20200814110554)
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