The variability of children of different ages and its relation to school classification and grouping Cornell, Ethel Letitia 1892- creator text nyu Albany The University of the state of New York 1937 monographic eng
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98 p. diagrs., tables. 23 cm. by Ethel L. Cornell ... Individuality Ability grouping in education LB3061 .C648 University of the state of New York bulletin, no. 1101 Educational research studies, 1937, no. 1 e 37000184 U.S. Office of Education 820630 20260227111226.0 e 37000184