Mental and scholastic tests among retarded children : physically defective, canal boat and Gipsy children, and backward children in ordinary elementary schools : an enquiry into the effects of schooling on the various tests
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Mental and scholastic tests among retarded children : physically defective, canal boat and Gipsy children, and backward children in ordinary elementary schools : an enquiry into the effects of schooling on the various tests
（Educational pamphlets, 44）
His Majesty's Stationery Office, 1923
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