TThe elementary arithmeticThe elementary arithmeticde Gordon A. Southworth, John C. StoneMateriasArithmeticEdiciones (1)The elementary arithmetic (1909)B.H. Sanborn · inglésMás obras de Gordon A. SouthworthThe Essentials of Arithmetic, Oral and Written1895The Southworth-Stone Arithmetic: A Rational Method. Bk. I, for Lower Grades1904A course of language study in outline