00863cam a22002411 4500 e 13000939 DLC 20260227111159.0 850920s1913 nyua 000 0 eng c e 13000939 (OCoLC)12580557 Library, U.S. Bur. of Education KyU KyU DLC premarc LB3063 .A9 Ayres, Leonard Porter, 1879-1946. The effect of promotion rates on school efficiency, by Leonard P. Ayres ... New York City, Division of Education, Russell Sage Foundation, 1913. 13 p. diagrs. 23 cm. [Russell Sage Foundation, New York. Dept. of Child Hygiene. Pamphlet] E130 Reprinted from the American school board journal, May, 1913. Promotion (School) School attendance. 19504 19504