The tradesman's directory; or, a short and easy method of keeping his books of accompts 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