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The Cleveland School Survey: Summary Volume (Rise of Urban America) - Leonard Porter Ayres
The public schools of Springfield, Illinois;: Educational section of the Springfield survey conducted under the direction of Leonard P. Ayres, PH. D ( - Leonard Porter Ayres
The effect of promotion rates on school efficiency, ([Russell Sage Foundation, New York. Dept. of Child Hygiene. Pamphlet]) - Leonard Porter Ayres
The new attitude of the school towards the health of the child, ([Russell Sage Foundation. Dept. of Child Hygiene. Pamphlets] Health, education, re - Leonard Porter Ayres
A study of the school histories of the 16,000 children who graduated from the eighth grades of the public schools of New York City in June 1909 - Leonard Porter Ayres
Seven great foundations, - Leonard Porter Ayres
The public schools of Springfield, Illinois: A survey (The Springfield survey) - Leonard Porter Ayres
Significant development in educational surveying (National Education Association of the United States. Journal of proceedings and addresses) - Leonard Porter Ayres
The economy of time thru testing the course of study and time allotment: [Economy of time in elementary education, D] (National education association - Leonard Porter Ayres
The money cost of repetition versus the money saving through acceleration, ([Russell Sage foundation. Dept. of child hygiene. Pamphlets]) - Leonard Porter Ayres
Some conditions affecting problems of industrial education in 78 American school systems ([Russell Sage foundation, New York. Division of education. P - Leonard Porter Ayres