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WORLD BOOK COMPANY

THE HOUSE OF APPLIED KNOWLEDGE

Established, 1905, by Caspar W. Hodgson

YONKERS-ON-HUDSON, NEW YORK
2126 PRAIRIE AVENUE, CHICAGO

Publishers of the following professional works: School Efficiency Series, edited by Paul H. Hanus, complete in thirteen volumes; Educational Survey Series, seven volumes already issued and others projected; School Efficiency Monographs, eleven numbers now ready, others in active preparation.


SCHOOL EFFICIENCY MONOGRAPHS