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Harold Ordway Rugg Knihy

    Fundamentals of High School Mathematics: A Textbook Designed to Follow Arithmetic
    The Experimental Determination of Mental Discipline in School Studies
    The Content of American History as Taught in the Seventh and Eighth Grades; an Analysis of Typical School Textbooks
    Statistical Methods Applied to Education; a Textbook for Students of Education in the Quantitative Study of School Problems
    City and Key Industries in Modern Nations / by Harold Rugg, Earle Rugg, Emma Schweppe.