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John Brass

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The art of ready reckoning, or, Mental and practical arithmetic
The Art of Ready Reckoning, Or, Mental and Practical Arithmetic [microform]: Reduced to a System, and Published for the Public of Canada; Being Partic
The Art of Ready Reckoning Or, Mental and Practical Arithmetic Reduced to a System, and Published for the Public of Canada; Being Particularly Adapted for Men of Business, as Well as for Schools
The art of ready reckoning, or, Mental and practical arithmetic: reduced to a system, and published for the public of Canada ; being particularly adapted for men of business, as well as for schools