TY  - BOOK
AU  - Cornell,Ethel Letitia
TI  - The variability of children of different ages and its relation to school classification and grouping,
T2  - University of the state of New York bulletin,
AV  - LB3061 .C648
PY  - 1937///
CY  - Albany
PB  - The University of the state of New York
KW  - Individuality
KW  - Ability grouping in education
ER  -