Proportional Formulae, Bi-Complex and Tri-Complex, or a System Algebraically Derived from the Nature of Proportionals: For the Facilitation of That Process in Arithmetic, Commonly Called the Rule of Three (Classic Reprint)
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Proportional Formulae, Bi-Complex and Tri-Complex, or a System Algebraically Derived from the Nature of Proportionals: For the Facilitation of That Process in Arithmetic, Commonly Called the Rule of Three (Classic Reprint)
