Unitary Arithmetic: Embodying the First Book of Arithmetic of the Irish National Board with a Full Exposition of the Unitary System or Method of Working Arithmetic Without Rules, with Numerous Additional Examples, and Selections from Examination Papers Se
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Unitary Arithmetic: Embodying the First Book of Arithmetic of the Irish National Board with a Full Exposition of the Unitary System or Method of Working Arithmetic Without Rules, with Numerous Additional Examples, and Selections from Examination Papers Se
