Studies on a child population. I, Definition of the sample, method of ascertainment, and analysis of the results of a group intelligence test / by J.A. Fraser Roberts, R.M. Norman and Ruth Griffiths.

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Norman, R. M.

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Studies on a child population. I, Definition of the sample, method of ascertainment, and analysis of the results of a group intelligence test / by J.A. Fraser Roberts, R.M. Norman and Ruth Griffiths.