00863cam a22002411  4500001001300000003000400013005001700017008004100034010001700075035002000092040005100112042001200163050001600175100003900191245008100230260007500311300002700386490008000413500006500493650002300558650002300581999001700604e  13000939 DLC20260227111159.0850920s1913    nyua          000 0 eng c  ae  13000939   a(OCoLC)12580557  aLibrary, U.S. Bur. of EducationcKyUdKyUdDLC  apremarc00aLB3063b.A91 aAyres, Leonard Porter,d1879-1946.14aThe effect of promotion rates on school efficiency,cby Leonard P. Ayres ...  aNew York City,bDivision of Education, Russell Sage Foundation,c1913.  a13 p.bdiagrs.c23 cm.0 a[Russell Sage Foundation, New York. Dept. of Child Hygiene. Pamphlet]vE130  aReprinted from the American school board journal, May, 1913. 0aPromotion (School) 0aSchool attendance.  c19504d19504