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Oliver A. Shaw

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A Description of the Visible Numerator With Instructions for Its Use ... Designed to Impart to Learners a Clear and an Adequate Knowledge of the Principles of Arithmetic, and to Accompany the Apparatus
A Description of the Visible Numerator With Instructions for Its Use ... Designed to Impart to Learners a Clear and an Adequate Knowledge of the Principles of Arithmetic, and to Accompany the Apparatus