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Jean Walker Macfarlane, Studies in Child Guidance: I. Methodology of Data Collection and Organization, Monographs of the Society for Research in Child Development, Vol. 3, No. 6, Studies in Child Guidance: I. Methodology of Data Collection and Organization (1938), pp. i-vii+1-177+179+181-254
Jean Walker Macfarlane (Sat,) studied this question.