TY  - BOOK
AU  - Ayres,Leonard Porter
TI  - The effect of promotion rates on school efficiency,
T2  - [Russell Sage Foundation, New York. Dept. of Child Hygiene. Pamphlet]
AV  - LB3063 .A9
PY  - 1913///
CY  - New York City
PB  - Division of Education, Russell Sage Foundation
KW  - Promotion (School)
KW  - School attendance
N1  - Reprinted from the American school board journal, May, 1913
ER  -