1. A complete system of practical mathematic and three forms of book-keeping : the two first of which are upon a more useful plan for retail trade than any extant, and the last by double entry Title: A complete system of practical mathematic and three forms of book-keeping : the two first of which are upon a more useful plan for retail trade than any extant, and the last by double entry Date: 1779. Author: Hedley, William (Mathematician) Collecting Area: Rare Books