The tradesman's directory; or, a short and easy method of keeping his books of accompts [electronic resource] : so as readily to know at any time the state of his affairs, upon any particular accompt, whether of men, money, or goods. Also how to bring his books to a ballance, and to know his profits or losses in the whole course of his trade. By Charles Snell, master of the free-writing-school, in Foster-Lane, near Cheap-side, London.