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Books
Elementary Arithmetic For The Slate : In
In Which Methods and Rules Are Based Upon Principles Established by Induction »
In Which Methods and Rules Are Based Upon Principles Established by Induction »
Mental Arithmetic : Combining A Complete
Combining a Complete System of Rapid Computations with Correct Logic of the Solutions of Problems and the Analyses of Processes »
Combining a Complete System of Rapid Computations with Correct Logic of the Solutions of Problems and the Analyses of Processes »
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