Problems in arithmeticde Gordon A. SouthworthMateriasArithmeticProblems, exercisesEdiciones (1)Problems in arithmetic (1903)Benj. H. Sanborn & Co. · 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