A Concise System of Commercial Arithmetic, Adapted to Modern Practice. With an Appendix; Containing a Series of Queries on Bills, and Merchants' Accounts; Comprising the Substance of the Mercantile Law and Practice; with Regard to the Nature, and Negotiation of Drafts; and Foreign Bills of Exchange. To which are Subjoined, a Course of Mercantile Letters; Also, Duodecimals, Timber-measuring, Artificers' Computations, and the Square and Cube Root; with Their Application PDF Download