Leonard Porter Ayres

The War With Germany: A Statistical Summary

Health Work In The Public Schools

Price Changes And Business Prospects

Price Changes And Business Prospects

Health Work In The Public Schools (Classic Reprint)

The Great Events Of The Great War; A Comprehensive And Readable Source Record Of The World's Great War, Emphasizing The More Important Events, And Pre

The Public Schools Of Springfield, Illinois, 1914: Educational Section Of The Springfield Survey Conducted Under The Direction Of Leonard P. Ayres, Ph D (Classic Reprint)

Health Work In The Public Schools

The Money Cost Of Repetition Versus The Money Saving Through Acceleration