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Elementary Arithmetic For The Slate
In Which Methods And Rules Are Based Upon Principles Established By Induction »
In Which Methods And Rules Are Based Upon Principles Established By Induction »
Elementary Arithmetic, For The Slate
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 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 »
Ideeënbus
